The rechargeable batteries will Offer you around 25 several hours of play time for every juice-up. You can also us your Marshall to reply, decline, and stop calls. Lame. Not your fault although, they set the "Phone" button right on there next to the speaker's bass and treble adjustment https://www.bluetoothspeaker.top/bt-portable-rgb-light-bluetooth-speaker-music-column-3d-stereo-boombox-speakers/