The rechargeable batteries will give you around 25 hours of play time for every juice-up. You may also us your Marshall to reply, decline, and conclude calls. Lame. Not your fault though, they set the "Phone" button right on there next to the speaker's bass and treble adjustment knobs. https://www.bluetoothspeaker.top/hot-selling-wireless-speaker-bt-5-0-portable-speaker-loud-waterproof-speaker/