The rechargeable batteries will Supply you with around 25 hrs of play time for every juice-up. You can even us your Marshall to reply, decline, and close calls. Lame. Not your fault while, they place the "Phone" button proper on there beside the speaker's bass and treble adjustment knobs. https://www.bluetoothspeaker.top/top-fashion-surround-sound-audio-multi-function-rgb-color-led-light-bluetooth-speaker/