Custom Sound: Choose from 22 preset EQs in the Souridcore app and customize tap controls. Use soundcore signature BassUp preset to boost your bass. LONG PLAYTIME & QUICK CHARGE Get 9 hours playback on an asingle charge that extends up to 28 hours with the charging case. Charge the true soundcore A25i wireless earbuds for 10 minutes for an additional 2 hours of playback, so you can charge them on the go. DESIGNED FOR PORTABILITY - The soundcore A25i wireless earbuds are small and lightweight with a compact case. It also comes with a lanyard, so you don't have to worry about space in your bag or pockets. Enhanced Clear Calls - An Al algorithm and 2 built-in microphhones ensure your voice is always heard clearly during calls, no matter how noise your surroundings are. LIGHTWEIGHT AND COMFORTABLE: Enjoy extended listening sessions and exceptional comfort with the ergonomic and lightweight design of the A20i wireless headphones. 【Easy and Stable Connection】After first easy pairing, the headphones automatically connect to the last paired device when you take them out of the case. The headphones also use Bluetooth 5.3, for fast and stable connection