The rechargeable batteries will Present you with around twenty five hours of play time for each juice-up. You can also us your Marshall to answer, decline, and close calls. Lame. Not your fault although, they set the "Phone" button appropriate on there next to the speaker's bass and treble https://www.bluetoothspeaker.top/outdoor-waterproof-speakers-wireless-outdoor-bluetooth-speaker-with-usb-and-tf-card-zealot/