KKmoon Wireless Bluetooth 4.0 Audio Receiver Digital Sound Audio Decoding Fiber Coaxial Transmission Sound for Smart Phones iPad iPhone iPod Touch Laptop Tablet Computer Support A2DP/IOPT Bluetooth specification: Uses Bluetooth 4.0 technology, and support A2DP protocol, not only greatly improve the data transfer rate, but also to ensure a more stable and sound quality of audio stream. Not only provides us a wider audio bandwidth, and the voice transmission is more comparable to CD-quality, but also supports earlier SBC encoding. This product is perfectly compatible with the mobile devices which have Bluetooth function and support A2DP protocol such as, for iPad, for iPhone, for iPod touch or other brands of mobile phones and computers. The transmission distance is up to 10 meters (Note: The actual distance of testing with Samsung mobile phones can reach up to 20m).