The rechargeable batteries will give you around 25 hrs of play time for each juice-up. You can even us your Marshall to answer, decline, and close calls. Lame. Not your fault however, they place the "Phone" button suitable on there next to the speaker's bass and treble adjustment knobs. https://www.bluetoothspeaker.top/high-sound-quality-wireless-bluetooths-speaker-with-rechargeable-battery/