The speaker utilizes CSR 4.0 Bluetooth for high quality music streaming and you will connect the speaker to your smartphone or tablet devices. The speaker will come with a built-in rechargeable 3600mAh battery and charges by using the micro USB port. The speaker also come with a built-in UNC https://www.bluetoothspeaker.top/new-flip-6-wireless-bluetooth-speaker-waterproof-ipx6-smart-speaker-for-smartphone/