Bluetooth 5.3, Anker Soundcore A25i App Personalized Sound Playtime of 28 Hours Water-Resistant Two Microphones for Unobstructed Calls Black is the exclusive earphone mode. Personalized Sound: Customize the tap controls and select from 22 preset EQs in the Souridcore app. To improve your bass, use Soundcore's exclusive BassUp preset. Long Playtime and Quick Charging: With a single charge, you can play for nine hours, and with the charging case, you can play for twenty-eight hours. Sound charge