Awolf Wireless Bluetooth Digital Optical Transmitter Digital Sound Audio Decoding Support A2DP/IOPT using the latest Bluetooth 2.1 technology, support A2DP agreement, not only greatly improve the data transfer rate, but also ensure the stability of audio and sound quality. This product can be used with devices with optical fiber line or coaxial line or stereo audio line, such as TV, Blu-ray DVD or computer. Transmission distance up to 10m. Can memory 10 groups device which paired with it already, and automatically paired when next time you use. Uses optical fiber, coaxial line and 3.5mm audio output, ensure the super sound quality and easy to connect with all devices. After power it on, long press the white power switch to turn it on, then you can pair it with your device, or it can not work.