The rechargeable batteries will give you around 25 hours of play time for each juice-up. You can also us your Marshall to answer, decline, and end calls. Lame. Not your fault although, they put the "Phone" button appropriate on there close to the speaker's bass and treble adjustment knobs. https://www.bluetoothspeaker.top/professional-bluetooth-speaker-long-range-illusion-flowing-led-light/