The rechargeable batteries will give you around twenty five several hours of play time per juice-up. You can even us your Marshall to answer, decline, and stop calls. Lame. Not your fault though, they put the "Phone" button proper on there beside the speaker's bass and treble adjustment knobs. https://www.bluetoothspeaker.top/wireless-bluetooths-stereo-speaker-creative-inalambrico-bluetooths-stereo-speakers/