The speaker uses CSR 4.0 Bluetooth for high quality music streaming and you can connect the speaker to your smartphone or tablet devices. The speaker will come with a built-in rechargeable 3600mAh battery and charges through the micro USB port. The speaker also come with a built-in UNC threated https://www.bluetoothspeaker.top/bluetooth-speakers-colorful-sound-with-rgb-light-stereo-speaker-wireless-speaker-with-led-light/