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 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. AI-Enhanced Clear Calls: An AI algorithm and 2 built-in microphones ensure that your voice is always heard clearly on calls, no matter how noisy your surroundings are. Lightweight and Comfortable: Enjoy extended listening sessions and exceptional comfort due to the ergonomic and lightweight design of A20i true wireless earbuds.