The rechargeable batteries will Provide you around 25 hours of play time for every juice-up. You can also us your Marshall to answer, decline, and close calls. Lame. Not your fault nevertheless, they put the "Phone" button suitable on there next to the speaker's bass and treble adjustment knobs. https://www.bluetoothspeaker.top/ipx4-waterproof-subwoofer-bluetooth-wireless-outdoor-portable-mini-bluetooth-speakers/