The rechargeable batteries will give you around twenty five several hours of play time per juice-up. You can also us your Marshall to answer, decline, and close calls. Lame. Not your fault although, they set the "Phone" button proper on there next to the speaker's bass and treble adjustment https://www.bluetoothspeaker.top/bluetooth-speaker-rgb-light-party-wireless-speakers-sound-amplifiers-music-speaker/