Long-life rechargeable battery with approximately 50 hrs of cordless sound and USB port for charging devices While the microphone integrated with the speaker is a good touch, some users have reported that the quality could be better. In addition, a handful of users have experienced issues with Bluetooth connectivity. https://www.bluetoothspeaker.top/led-speaker-waterproof-speaker-outdoor-subwoofer-bass-wireless-bluetooth-speakers/