The rechargeable batteries will give you around twenty five hrs of play time for every juice-up. You may also us your Marshall to answer, decline, and conclusion calls. Lame. Not your fault nevertheless, they place the "Phone" button correct on there beside the speaker's bass and treble adjustment knobs. https://www.bluetoothspeaker.top/outdoor-speaker-waterproof-ipx6-bluetooths-speaker-portable/