The rechargeable batteries will Provide you with around 25 hours of play time per juice-up. You may also us your Marshall to answer, decline, and finish calls. Lame. Not your fault though, they place the "Phone" button correct on there close to the speaker's bass and treble adjustment knobs. https://www.bluetoothspeaker.top/bt-multi-function-led-light-call-function-bluetooth-speaker/