The speaker utilizes CSR 4.0 Bluetooth for high quality music streaming and you can connect the speaker to your smartphone or tablet devices. The speaker comes with a built-in rechargeable 3600mAh battery and charges by way of the micro USB port. The speaker also come with a built-in UNC https://www.bluetoothspeaker.top/usb-tf-aux-strong-bass-home-theater-subwoofer-party-stereo-wireless-bluetooth-speaker/