The speaker makes use of CSR four.0 Bluetooth for high quality music streaming and you can connect the speaker to your smartphone or tablet devices. The speaker arrives with a built-in rechargeable 3600mAh battery and charges through the micro USB port. The speaker also arrive with a built-in UNC https://www.bluetoothspeaker.top/best-selling-flip-6-speakers-stereo-bass-subwoofer-wireless-tws-speakers/