Soundcore by Anker A20i True Wireless Earbuds, Bluetooth 5.3, App, Customized Sound, 28H Long Playtime, Water-Resistant, 2 Mics for AI Clear Calls, Single Earbud Mode (Black)Customized Sound: Choose from 22 preset EQs in the soundcore app and customize the tap controls. Use soundcore's signature BassUp preset to boost your bass. Long Playtime and Fast Charging: Get 9 hours of playtime on a single charge that extends to 28 hours with the charging case. Charge soundcore A20i true wireless earbuds for 10 minutes for an extra 2 hours of playtime, so you can charge on the go. Designed for Portability: soundcore A20i true