Outlook on the top ten development trends of TWS headphones in 2021

The current TWS headset market has developed from a dark horse to a good one. The steady growth of market and sales year by year has promoted the rapid development of the Bluetooth headset market and brought many new opportunities. The beginning of all this can be traced back to Apple's official cancellation of the 3.5mm audio interface on the iPhone 7 series in 2016 and the launch of a new product line, Apple AirPods true wireless headsets.

The 5Audio database shows that in the past four years, global sales of branded true wireless headphones were 46 million units in 2018 and 90 million units in 2019, an increase of 96% compared to 2018. In the difficult year of 2020, the sales of branded TWS headphones continued to grow, reaching 300 million units, a year-on-year increase of 230%.

Among them, mobile phone brands occupy a major position in the current TWS headset market based on the huge user base of the mobile phone market and the more comprehensive user experience brought by dual-end optimization. Although Apple's market share is declining, it still occupies a market share of up to 40%, ranking first. Xiaomi, Samsung, Huawei, Realme, OPPO, etc. followed closely behind.

The rapid development of TWS true wireless earphones has also driven the industrial upgrading of related supply chain manufacturers. The progress of main control chips, power management ICs, wireless charging receiver chips, charging box batteries, earbud batteries, touch control and other technologies has improved the performance and functions of TWS earphones and brought a better user experience. The virtuous circle formed is promoting the stable and healthy development of TWS true wireless earphones.

As the new year of 2021 begins, I Love Audio has made many reports on the major changes in the audio market that have become history, analyzing the market development in 2020 from multiple aspects.

This time, let us look forward to the future together and explore the future development trends from more than ten aspects, including TWS headset product form, Bluetooth technology standards, special sound effects, intelligent interaction, human health applications, active noise reduction, main control chips, sensors, speakers, power management chips and batteries.

1. TWS earphone product form: bean-shaped, handle-shaped, sports ear-hook

Although the current TWS true wireless earphones have their own characteristics in appearance, they are mainly divided into two forms: "handle-shaped" and "bean-shaped", as well as two types of in-ear styles: in-ear style with earplugs and semi-in-ear style without earplugs. Another type is the ear-hook product that is mainly biased towards the sports market and can provide a more stable wearing experience.

Among them, semi-in-ear headphones can bring a comfortable wearing experience, and the music sound field is relatively comfortable, without producing a stuffy feeling of oppression and buzzing in the head; in-ear headphones fit closely to the ear canal due to the presence of earplugs, have a strong airtightness, and are more conducive to the active noise reduction function; and the "bean-style" headphones are small and light, comfortable to wear and more beautiful.

In 2020, active noise reduction became popular all over the world, and all new mid-to-high-end flagship products launched by various brands are equipped with this function. And in 2021, the price of products supporting active noise reduction is becoming more and more affordable, and the era of standard active noise reduction is coming.

For example, the recently released 1MORE ComfoBuds Pro, Huawei FreeBuds 4i, Soundcore Noise Cancelling Pod, Samsung Galaxy Buds Pro, Libratone AIR+ 2nd Generation and other products all support active noise reduction and adopt in-ear design. Among them, only one Samsung model has a bean-shaped appearance, while the rest are handle-shaped.

Although each brand has its own design style in appearance design, many new TWS headsets are gradually tending towards a handle-shaped in-ear design. From the product itself, this structure is more conducive to signal stability and sound transmission. At the same time, a large number of positive feedback from consumers also shows their recognition of the handle-shaped structure.

In addition to the active noise reduction function mentioned above, the addition of call noise reduction, bone conduction, spatial audio and other functions also requires more space for firmware support. Therefore, the handle-shaped in-ear design may still be the mainstream TWS headset form in the next few years.

2. Bluetooth audio technology standards: Bluetooth 5.2, LE Audio

The addition of Bluetooth technology can be said to be a major turning point in the development of headphones. It effectively reduces the constraints of wires on the use of headphones, lays the foundation for the popularity of TWS true wireless headphones, and is one of the most important technologies in TWS true wireless headphones.

In 2020, the Bluetooth SIG launched a new generation of Bluetooth audio technology standard - LE Audio. Based on the Bluetooth 5.2 standard, it adopts the new LC3 high-quality, low-power audio decoder; it expands the application of Bluetooth technology, supports multiple streaming audio and broadcast audio technology, and can provide strong support for hearing aids, providing many new development directions for future TWS headset functions.

Recently, Qualcomm released a report titled "Questions and Answers about LE Audio", which detailed what LE Audio is, why LE Audio was launched, what advantages LE Audio has, what new use cases it provides, and the impact of LE Audio on Qualcomm's future audio products and technologies. Currently, at least 9 major brands have launched 16 new headphones that support Bluetooth 5.2. In the future, these two technologies will be rapidly popularized to enhance the user experience of TWS headphones.

3. Special audio functions: spatial audio, 360-degree surround sound

The special sound effects of TWS true wireless headphones are also a feature that users pay close attention to. Currently, the main applications on TWS headphones include Apple's spatial audio, Sony's 360-degree sound effects, and the latest Samsung 360-degree sound effects. The main similarity is that they can provide a sound experience that feels like being there when watching videos.

Spatial audio is a feature introduced by Apple at the WWDC20 Global Developers Conference. The first product to support this feature was the Apple AirPods Pro true wireless headphones. In 2020, Apple AirPods Max headphones were released, which also support spatial audio. According to the information leaked by I Love Audio, the new Apple AirPods4, which will be released soon, may also be equipped with this feature.

Spatial audio is achieved by adding directional audio filters, fine-tuning the frequencies received by each ear, and using accelerometers and gyroscopes to track head movements. It then uses the motion data of the relative movement of the head and the screen to analyze usage scenarios such as vehicle turning and airplane tilting, and continuously remaps the sound field position to achieve an immersive audio experience.

360 Reality Audio is an audio technology launched by Sony at the CES International Consumer Electronics Show. It integrates live instruments like in a concert into a 360-degree spherical space and reproduces them in the music of the headphones based on the determined distance and angle information, giving people an immersive music experience.

The 360-degree sound function is a new feature launched by Samsung in Galaxy Buds Pro, which can give the sound a sense of direction and distance. Samsung Galaxy Buds Pro uses Dolby head tracking technology. When users are watching videos, movies or TV shows, the intelligent motion tracking sensor (six-axis accelerometer) will accurately locate the direction of the sound in real time as the head moves.

The spatial sound function effectively enriches the functions of TWS headphones and gives users a new audio experience. However, it also requires the support of sensors and complex software algorithms, so currently only leading brands such as Apple, Sony, and Samsung support this function.

But in the future, this function will or will become a trend, and more brands will equip their products with this function to enhance the competitiveness of their own products. At the same time, the industry generally believes that this technology paves the way for future AR/VR and other functions and has good application prospects.

4. Intelligent interaction methods: voice interaction, gesture control, pressure sensing, translation function

The current interactive experience of TWS true wireless headphones mainly includes physical buttons, touch buttons, pressure-sensitive buttons, and a combination of touch and pressure-sensitive controls.

The pressure-sensitive buttons combine many of the advantages of the former. They can achieve control methods similar to physical buttons without destroying the integrity of the appearance of the headphones. They have high sensitivity and accuracy, and avoid the problem of accidental touches. They may become the main operation method of TWS true wireless headphones in the future.

Smart Voice Assistant

Intelligent voice interaction is currently a way to control TWS true wireless headphones, but currently TWS headphones voice interaction is mainly carried out through the voice assistant of the connected terminal device. Therefore, it requires the support of the connected device and the need to wake up through a button before it can be used.

However, I Love Audio Network also saw that there are already products such as 360 PlayBuds Pro with built-in intelligent voice, which can be used to find mobile phones, check translations, set navigation, set alarms, send WeChat messages, etc. after being awakened by the wake-up word. Moreover, in high-frequency operations, various operations can be performed without the need for wake-up words, freeing up hands and improving the user experience.

Gesture Control

Gesture control is a novel interactive method that has been successfully applied on smartphones and smart speakers with screens. It can operate the device accordingly through different gestures. On TWS true wireless headphones, this air-to-air interactive method requires the addition of sensors such as gyroscopes and accelerometers, and then cooperates with relevant algorithms to realize this function.

Gesture control is also a major development direction for true wireless headphones in the future, and audio manufacturers are currently conducting related research. A patent for a "wearable interactive audio device" applied by Apple in 2020 shows that Apple is also actively researching how to achieve air-to-air interaction by adding new sensors, providing more options for future AirPods users.

Translation function

The translation function is a new application of intelligent voice interaction. Currently, the products with better applications on the market are Xiaodu True Wireless Smart Headphones XPods and iFLYBUDS. Both products can translate voice during calls through the corresponding APP, and the English and translated content will be recorded in real time on the mobile phone interface for reference. This function is mainly aimed at specific scenarios and may not be widely popularized in the future development of TWS headphones, but it is an important development direction of TWS headphones.

Pressure sensing combined

If we talk about the best interactive operation solution, then the combination of multiple methods must be the best way to improve the user experience. Not only can it further enrich the control options, but it can also give users free choice and enhance personalized usage needs.

There are two TWS earphones that have received good reviews in the market for the pressure sensing function, Apple AirPods and Huawei Freebuds Pro. Among them, Huawei FreeBuds Pro true wireless noise-cancelling earphones can be said to be the product with the most complete application of multiple interactive methods on the market. It not only integrates touch and pressure sensing control methods, but also supports bone voiceprint recognition.

Find the bone voiceprint settings of Huawei FreeBuds Pro in the Bluetooth settings of the mobile phone, and you can select the purpose of bone voiceprint recognition, including saying "Xiaoyi Xiaoyi" to the headset to unlock the device, saying "WeChat Pay" to jump to the WeChat payment interface, and saying "Alipay Pay" or "Alipay Scan" will also jump to the corresponding interface. It can be used regardless of whether the phone screen is on or off, and there is no need to wake up the voice assistant of the headset first, which is very quick.

5. Human health detection applications: heart rate, hearing aid

With the rapid development of Bluetooth headsets and related technologies, the product functions of current TWS true wireless headsets have been greatly expanded. Continuously enrich product applications and enhance the overall user experience. Among them, hearing aids, health detection and other functions have always been a key point of concern for brand products and users. Therefore, many manufacturers are currently actively exploring this aspect, combining headphone products with health monitoring, assistance and other functions.

Hearing aids

In the current Bluetooth headset market, hearing aid Bluetooth headset products are mainly used in neck-hanging Bluetooth headset products, such as BeHear Now hearing aid neck-hanging Bluetooth headset ABH-101B, 1MORE/Wanmo EHD9001B, etc.

I Love Audio Network learned that after the system was updated, Apple iPhone added a "hearing" function, which can directly make your phone a microphone and AirPods a receiver when paired with AirPods. It effectively assists people with hearing loss to hear the surrounding sounds. And this function can also provide long-distance sound reception for normal people.

Health Check

Health monitoring function has always been an important development direction for smart wearable devices, and it has been developed more maturely in bracelets and watches. TWS headphones also have the characteristics of close contact with the human body and easy to wear, which can be well applied to health detection functions.

Huami Technology's Amazfit ZenBuds sleeping earbuds are such a product. The earbuds can play sleep-inducing music to help users fall asleep. They can also monitor heart rate and record sleep status and stages during sleep. Users can view sleep quality reports in the APP. The content includes deep sleep percentage, light sleep percentage, number of awake times, average heart rate during sleep, number of tossing and turning, and common sleeping positions. In the future, more TWS headphones may be equipped with health detection functions to enhance user experience.

6. Intelligent Active Noise Cancellation

The active noise reduction function was originally applied to head-mounted noise-cancelling headphones, because headphones have excellent earmuffs that can achieve physical passive noise reduction. At the same time, the earmuffs also have enough space, which can provide the possibility for the realization of excellent active noise reduction. Very representative manufacturers include BOSE and SONY.

Active Noise Cancellation

When Apple AirPods Pro combined active noise reduction with TWS true wireless headphones, it quickly became popular in the market. Active noise reduction also leapt from its original niche function to the mass demand market.

In 2020, various brands began to gradually launch headphone products that support active noise reduction functions to layout the market and enhance the competitiveness of their own products. In the 2020 annual summary, I Love Audio Network made a detailed summary and analysis report on the disassembly of 24 active noise reduction true wireless headphones.

In 2021, the competition for TWS noise-cancelling headphones is even more intense, and many new products released at the beginning of the year support active noise reduction mode. Huawei also launched the relatively more affordable Huawei FreeBuds 4i wireless noise-cancelling headphones to compete in the mid-to-low-end market. All of this shows that active noise reduction will still be a trend in the next few years.

Although active noise-cancelling headphones are currently not as comfortable to wear as semi-in-ear headphones with open ear canals due to their need for an in-ear shape to achieve better noise-cancelling effects, and the noise-cancelling function causes ear pressure and discomfort for some sensitive people, in the future, with the advancement of intelligent adaptive noise-cancelling technology and the emergence of open-ear noise-cancelling headphones, the comfort of noise-cancelling headphones will continue to improve, thereby meeting the noise-cancelling needs of different groups of people.

AI intelligent call noise reduction

According to the consumer survey conducted by I Love Audio, making phone calls is the most popular function for most consumers after purchasing TWS headphones. In daily life, the scenarios in which we make phone calls are very rich and complex, such as subways, buses, roadsides, restaurants, offices, study rooms, etc., which will bring great challenges to the calling function of headphones.

Therefore, the call noise reduction function has directly become a rigid demand for TWS headsets. Currently, TWS headset products on the market mainly perform call noise reduction in three ways, namely, a single-microphone solution, a dual-microphone array solution, and with the assistance of accelerometers, VPUs and in-ear microphones.

However, most traditional call noise reduction solutions use multi-microphone arrays, which are difficult, costly, and have very limited noise reduction scenarios. Therefore, we have also seen AI intelligent call noise reduction solution providers in the market, and there are already many well-known TWS headset product application cases, from: Soundplus Technology and Elephant Sound Technology. In the future, the demand for AI call noise reduction will increase significantly, and we are looking forward to more players entering the market.

7. Main control chip

The importance of the main control chip in TWS true wireless headphones is self-evident. Currently, there are dozens of manufacturers on the market that have entered the TWS main control chip market. The comprehensive and highly integrated Bluetooth audio SoC provides a strong guarantee for TWS headphones to realize many functions.

Unlike mobile phones and headphones, which are relatively large in size, TWS headphones have higher requirements for the size and integration of the main control chip due to the need for portability. And with the addition of many new configurations such as noise reduction and functional sensors, higher requirements are put forward for the space utilization in the cavity and the high integration of the chip.

Integrated ANC

In TWS true wireless earphones that support active noise reduction, in order to achieve better noise reduction effects, in addition to the reasons for the external earphone form mentioned above, the core factors are the ANC noise reduction chip and the noise reduction algorithm. However, among the current TWS earphones, most products still use a dedicated ANC noise reduction chip in addition to the Bluetooth main control SOC to achieve better noise reduction function.

With the development of TWS headphones, some true wireless noise-cancelling headphones, such as 233621 Zen, OPPO Enco X, OPPO Enco W51, Edifier TWS NB2, Urbanista London, etc., have adopted Bluetooth audio SOC with integrated ANC noise reduction technology, such as Qualcomm flagship chip QCC5124, Hengxuan BES2500Y, Zhongke Bluexun BT889X, etc. Previously, I Love Audio Network compiled the top-end Bluetooth audio master chips with integrated ANC for everyone.

While reducing the motherboard space, it also brings excellent noise reduction performance. Therefore, in the next few years, the market for main control chips with integrated ANC noise reduction function may continue to increase and occupy a major position.

Smaller size

There is a mutual influence between high integration and chip size. As the integration of the main control chip increases, the chip size also increases accordingly. The future development direction of TWS true wireless headphones will definitely be towards a more compact and lightweight direction, thereby improving wearing comfort and full-scenario applications. This requires the addition of higher chip manufacturing processes to reduce chip size, thereby efficiently utilizing the internal space of the headphones and reducing the size of the headphones. Therefore, smaller main control chips will also be the trend of future development.

Higher computing power

As people spend more and more time using TWS headphones and the number of usage scenarios continues to increase, there is a demand for more functional applications. How to achieve the functions mentioned in the top ten TWS development trends forecast by 51audio.com: featured audio, smart interaction, hearing aid and health monitoring, active noise reduction, etc., requires Bluetooth main control chip manufacturers to continuously pursue higher computing power.

SiP Package

Apple was the first to use the H1 chip with SiP (System in Package) system-level packaging on AirPods Pro. The main control chip of the recently released Samsung Galaxy Buds Pro also uses this packaging form.

SiP packaging can significantly reduce the area of ​​the circuit board, but the process is also relatively complex and has high requirements for chip layout, stacking, heat dissipation, etc. However, with the growing demand for miniaturized smart devices represented by TWS headphones, the demand for multi-functional integrated, low-power main control chips is increasing, and SiP technology will be able to provide a more ideal solution.

8. Sensor

Many functions of TWS true wireless earphones require the addition of corresponding sensors to provide hardware support. In current TWS earphones, the main sensor units include speakers for playing music, MEMS microphones for active noise reduction and calls, optical sensors for in-ear detection, bone voiceprint sensors for call noise reduction, and six-axis sensors for 360-degree surround sound.

MEMS microphones

In TWS earphones, the previous microphones were mainly used for voice calls. With the development of ANC and ENC noise reduction technologies in TWS earphones, in order to achieve better noise reduction effects, multi-microphone collaborative solutions have been widely adopted, and the performance requirements for microphones are also constantly increasing. MEMS silicon microphones have become mainstream due to their small size, SMT capability, strong stability and many other advantages.

In-ear detection

In-ear detection is an innovative feature that is popular with users in the rapid development of TWS headphones. It relies on optical sensors to automatically pause playback when the headphones are removed and automatically resume playback when the headphones are put back on. It effectively improves the user experience and can also avoid power consumption when not in use, thereby achieving a power-saving effect. In the current entry-level market for TWS headphones, many products do not yet have an in-ear detection function. In the future, in-ear detection will become a standard feature of TWS headphones.

Bone Vibration Sensor

The bone vibration sensor only collects the vibration information of the vocal cords and converts it into an audio signal, without the ambient noise transmitted in the air; the two-way call sound information received by the headset (one way is transmitted through the air and picked up by the microphone, and the other way is transmitted through bone vibration) is compared and analyzed by the noise reduction algorithm to attenuate the ambient noise, so as to achieve a better voice call effect. Compared with the traditional dual-microphone solution, it also better suppresses wind noise and ambient noise.

Currently, true wireless earbuds from brands such as Apple, Samsung, and Edifier have adopted a bone vibration sensor + multi-microphone call noise reduction solution. In addition, this type of sensor can also be used for bone voiceprint recognition technology. For example, Huawei's FreeBuds3 and FreeBuds Pro support bone voiceprint unlocking and bone voiceprint payment, which expands the functions of TWS earphones and improves the user experience.

Six-axis sensor

The six-axis sensor integrates an accelerometer and a gyroscope, and is mainly used to realize the tapping function and head rotation tracking, providing richer interactive design supplements, head control to answer or reject calls, and delicate head movement tracking to realize the 360-degree sound function of the headset.

speaker

In the early days of TWS earphones, due to the limitations of Bluetooth transmission, the sound quality of earphones has always been a point of complaint for many users. However, with the development of Bluetooth technologies such as Bluetooth 5.2 and LE Audio mentioned above, the limitations on Bluetooth audio transmission are rapidly decreasing.

On the other hand, the speaker unit also affects the sound quality. As a headphone product, the speaker is its most basic configuration. Currently, the main speaker products used in TWS headphones are dynamic units. Dynamic units have good low-frequency performance, but due to size limitations, they cannot take into account excellent mid- and high-frequency effects.

The balanced armature unit has the characteristics of small size, low power consumption and high sensitivity, and has been widely used in hearing aid products. However, with the rapid development of TWS earphones, balanced armature units have also begun to be used in some mid-to-high-end products to improve the sound quality. In addition, some products also use dual balanced armature units to further improve the sound quality.

Compared with dynamic drivers, balanced iron drivers are better at mid- and high-frequency performance and can provide higher resolution and detail, but they cannot achieve the same shocking effect as dynamic drivers at low frequencies. Therefore, dynamic-iron drivers emerged, which can achieve better results by combining dynamic drivers and balanced iron drivers to process different audio frequencies. The disadvantage is that dynamic-iron drivers are relatively larger in size and have higher requirements for product structural design.

In the future TWS earphones, unit combinations such as dynamic, balanced iron, dynamic iron and dual dynamic will all exist, and will continue to maintain diversified development, leaving the demand for sound quality to consumers to choose. In order to adapt to the size of true wireless earphones, unit miniaturization is also a trend.

9. TWS headset power management chip

The power management chip also plays a vital role in TWS earphones, ensuring the battery life of the earphones. The power management chip is mainly used for charging and discharging the earphones, as well as real-time protection against battery overcharge, over-discharge, over-current, over-temperature, short circuit, etc. during the charging and discharging process.

At present, the suppliers of new power management products are very mature and can meet the needs of various TWS headset products on the market. The ones that I Love Audio Network often see in disassembly include: Yutai, Siyuan Semiconductor, Microsource Semiconductor, Shengshengwei, etc.

Although the charging and discharging power of power management chips is not large compared to traditional devices, for products such as TWS headphones that have extremely high requirements for portability, there are relatively high requirements for their safety, low power consumption, high voltage resistance, high integration and high efficiency.

With the rapid development of TWS headphones, power management chips have also seen the emergence of highly integrated SoC single chips, integrated MCU functions, and two-in-one, three-in-one, and even six-in-one charging management solutions for TWS headphones. By 2021, this trend may be further amplified, and various manufacturers will launch power management chip products with better performance.

10. Battery life of TWS earphones and charging case

The development of TWS true wireless earphones is inseparable from the progress of battery technology. Before the release of Apple AirPods, the main reason why Bluetooth earphones were not widely popular was the battery life issue. However, Apple AirPods overtook others in terms of battery life, and the solution of earphones with charging cases quickly led the development of the industry.

With the development of TWS earphones, TWS earphone batteries are mainly divided into three categories to adapt to the different forms produced in the development process, namely polymer soft-pack batteries, button batteries and needle batteries. I Love Audio Network has previously compiled 145 TWS charging box batteries from 33 brands, 210 TWS earphone battery products from 30 brands, and 103 TWS earphone button batteries from 17 brands.

Among them, polymer soft-pack battery technology is relatively mature and relatively cheap. Due to the need to adapt to different headphone shapes, square, long, button and other shapes are formed; button batteries are gradually popular in TWS headphone batteries due to their small size, efficient use of the internal space of the headphones, and convenient welding of positive and negative electrodes; needle-type batteries are mainly used in handle-shaped Bluetooth headphones and occupy a small market.

Fast charging, wireless charging

Due to the limitation of battery technology development, in addition to the solution of charging case, another solution for TWS earphones is the development of fast charging technology. Fast charging can quickly replenish power and reduce the impact of short single battery life, which also effectively improves the user experience of TWS earphone products.

The application of wireless charging technology in TWS earphones is to improve the charging convenience of earphones. When the earphones are not in use, the charging box can be placed on the charging board and charged at any time to replenish energy in real time. According to incomplete statistics from I Love Audio, there are currently more than 10 TWS true wireless earphones that support wireless charging on the market.

Mobile phone products have gradually adopted the wireless charging function in an all-round way. Therefore, in order to perfectly match with peripheral audio accessories and charging accessories, a convenient function of reverse charging TWS true wireless earphones with mobile phones has also been launched.

Summary of I Love Audio Network

After more than 4 years, the TWS headset market has maintained rapid and stable development, and the current market still presents a flourishing situation. However, in terms of product form, brand share, and industry chain suppliers, they have begun to stabilize. Mobile phone brands have gradually occupied a dominant position, and the leading companies of important accessories such as main control chips and batteries have occupied a large market share, and the functions of headsets have also been gradually improved.

Judging from the current development of the TWS headset market to explore the development trend in the next few years, the popularity of active noise reduction function will make mainstream TWS headsets more likely to have a handle-shaped in-ear design; the new generation of Bluetooth audio technology standard LE Audio launched in 2020 will be rapidly popularized in 2021.

In terms of functions, in intelligent interaction, the built-in intelligent voice assistant may usher in a breakthrough. The ultra-low power standby voice wake-up function frees your hands and there is no need to perform various operations through the mobile phone. Intelligent voice translation will be applied to more products. Gesture control provides a new control experience, but the technology is more difficult and it will take some time to apply. Before that, the combination of pressure and sensing may be the best solution.

In terms of other functions, special audio functions, human health detection, hearing aids, bone conduction applications, etc. are new functional directions of TWS headphones that may have great development in recent years, thereby further enriching product functions and improving user experience. Speaker units may gradually turn to dynamic iron units and dynamic iron units that can bring better sound quality, thereby improving the music experience.

In terms of configuration, as the functionality of TWS headphones continues to increase, more firmware support is needed, which will put forward higher requirements for the internal space of the headphones. And with the continuous development of chip technology and the application of higher processes, the main control chip and power management chip will continue to improve in integration and performance, thereby meeting the rapidly growing demand for TWS headphones; in terms of battery life, button batteries may be widely used in TWS headphone batteries due to their smaller size, and fast charging and lower power consumption will also be the best solution to improve the headphone battery life experience.

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