The rechargeable batteries will Provide you with around 25 hrs of play time for each juice-up. You can also us your Marshall to reply, decline, and stop calls. Lame. Not your fault although, they place the "Phone" button proper on there beside the speaker's bass and treble adjustment knobs. https://www.bluetoothspeaker.top/high-end-speaker-bluetooth-promotion-soundcore-bluetooth-speaker/