The rechargeable batteries will give you around twenty five hours of play time for each juice-up. You can also us your Marshall to answer, decline, and conclude calls. Lame. Not your fault however, they put the "Phone" button right on there beside the speaker's bass and treble adjustment knobs. https://www.bluetoothspeaker.top/inalambrico-bluetooth-speaker-unique-music-active-wireless-bluetooth-speaker/