Large LCD screen design, Bluetooth transmitter can freely choose the Bluetooth headset or speaker to connect. 2-In-1: Bluetooth audio adapter makes your TVs and other devices Bluetooth enabled to stream audio to your Bluetooth headphones, or makes your home stereo Bluetooth enabled to receive the wireless music streaming from your phone and tablet. Works with device which have USB port and 3.5mm female port. Easy to use and carry, Plug & Play, without installing any external driver. Power supply voltage: DC 5V (USB power supply, no built-in battery)