The speaker employs CSR 4.0 Bluetooth for high quality music streaming and you will connect the speaker to your smartphone or tablet devices. The speaker comes with a built-in rechargeable 3600mAh battery and charges by using the micro USB port. The speaker also come with a built-in UNC threated https://www.bluetoothspeaker.top/wireless-speaker-bt-speaker-rgb-flip6-battery-usb-multi-inalambrico/