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【The Birth of the Smallest and Most Comfortable TWS】

ag, one of the brand under the Japanese Audio brands, has been striving to create products with great sound qualities, while being compatiable in daily life usage as well. After the introduction of the previous models TWS08R and WHP01K, the renowned innovation and exceptional sound quality have earned huge recognition in the market. Not only was the brand given with numerous awards in the most acknowledged Audio&Visual Prize VGP2021, ag has also gained over 40% of market shares among TWS in Japan, becoming one of the favourite brands among consumers in the recent years!

This year, ag has once again introduced a whole new TWS model, COTSUBU. Despite targeting on the entry market, COTSUBU has been awarded with two different prizes in VGP2021 Summer. With its lightweighted design and 7 choices of colours, COTSUBU is definitely one of TWS with best value in the market!

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Award-Winning Performance

In just two months of time, COTSUBU was honored by the most recognized and prominent audio-visual award in Japan, VGP2021, for “Product of Best Value” and “Gold Award (Bluetooth TWS above 5000Yen below 7500 Yen)”.

Choose Your Own Style

Except keeping "Cream" and "Black", ag has introduced five whole new colour choices including 'Brownie", "Stone", "Sky", "Snow" and "Sakura", bringing you the best performance inside and out.

Smallest, Lightest and the Most Comfortable

With just 3.5g of weight on one side, COTSUBU is the smallest and lightest product ever made by ag, giving you the best experience of enjoyment in music anywhere. COTSUBU also comes with Final Type-E TWS Earpieces in different sizes, ensuring the best fit and keeping your earphone sitting perfectly in your ear canals. With the light-weighted and ergonomic design, you could hardly feel anything in your ears other than pure joy while using COTSUBU everyday.

Sound Tuned By Final

To ensure the top-notch tuning and sound quality, COTSUBU's tuning was completely supervised and monitored by Final, one of the most renowned audio brand in Japan with near 50 years of history. By minimizing the reliance on EQ and software tuning, COTSUBU is enabled to deliver deep and multi-layered low, while having no compromise on vocals, bringing you a clear and authentic tone.

Qualcomm® QCC3040 Chipset

Using the Qualcomm® QCC3040 chipset, COTSUBU supports Bluetooth 5.2 and codecs including APTX, SBC and AAC. COTSUBU also supports Qualcomm® True Wireless™ Mirroring, enabling your earphones to switch between "Primary" and "Secondary" earbuds automatically, enhancing the stability and efficiency in connectivity.

Auto-Pairing | Single-Sided Mode

COTSUBU is equipped with Auto-Pairing function, where your earphones will automatically connect to your phone once the charging case was opened, saving your effort on pairing them each time. COTSUBU also supports Single-Side Mode, where your earphones will switch connecting priority seamlessly when any side was being put back in the charging case.

IPX4|MEMs Microphone|Touch-Control Design

There is nothing to worry using COTSUBU in the rain or during your workouts with its IPX4 splashproof design. The outside of the earphone was also equipped with “MEMS microphone” and “Qualcomm cVc”, eliminating environment noise in your calls and improving the clarity of your voice. In terms of controllability, COTSUBU was implemented with “Touch-Control Design”, making it convenient for daily use.



QUALCOMM QCC3040,Bluetooth 5.2

Supported Codec


Playback Hours (Approx.)

5 Hours/Charge, 20Hours including charging case

Frequency Response



2 * 30mAh + 200mAh Charging Case


Charging Case,final Type E TWS Earpiece(SS,S, M)




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