The speaker takes advantage of CSR 4.0 Bluetooth for high quality music streaming and you may connect the speaker to your smartphone or tablet devices. The speaker arrives with a built-in rechargeable 3600mAh battery and charges via the micro USB port. The speaker also come with a built-in UNC https://www.bluetoothspeaker.top/high-power-bt-speaker-wireless-stereo-subwoofer-music-player-outdoor-bluetooth-speaker/