The rechargeable batteries will give you around 25 hrs of play time for every juice-up. You can also us your Marshall to answer, decline, and finish calls. Lame. Not your fault nevertheless, they place the "Phone" button proper on there next to the speaker's bass and treble adjustment knobs. https://www.bluetoothspeaker.top/high-quality-wireless-charging-white-noise-bluetooth-speaker-with-time-display/