The rechargeable batteries will give you around 25 hrs of play time for each juice-up. It's also possible to us your Marshall to reply, decline, and conclude calls. Lame. Not your fault though, they place the "Phone" button suitable on there beside the speaker's bass and treble adjustment knobs. https://www.bluetoothspeaker.top/multi-color-stereo-speakers-subwoofer-wireless-sexy-bluetooth-speaker/