The rechargeable batteries will give you around twenty five hrs of play time per juice-up. You can also us your Marshall to reply, decline, and conclusion calls. Lame. Not your fault although, they put the "Phone" button suitable on there next to the speaker's bass and treble adjustment knobs. https://www.bluetoothspeaker.top/subwoofer-outdoor-bluetooth-speaker-smart-computer-studio-audio-wireless-speaker/