The rechargeable batteries will give you around twenty five hrs of play time for each juice-up. You may as well us your Marshall to reply, decline, and close calls. Lame. Not your fault although, they put the "Phone" button correct on there next to the speaker's bass and treble https://www.bluetoothspeaker.top/popular-bluetooth-5-0-speaker-colorful-led-speaker-with-passive-radiator-bass-enhanced/