Bluetooth Receiver Car Kit Portable Wireless Audio Adapter Converter 3.5 mm Aux Auxiliary Stereo Output Bluetooth 4.0, A2DP, Built-in Microphone for Home Car Audio Music Streaming Sound System This music receiver (hands-free) is designed to receive music from mobile phones or transmitters that feature bluetooth wireless technology. Simple and Easy Wireless Set-Up, Automatically connect, if you need the cell phone connect the receiver automatically, just turn on the Bluetooth of the cell phone first, and then turn on the Bluetooth receiver. Listen to music from your smart phone or MP3 player on your existing home or car audio system. To enjoy car music, call solutions, the use of smart phones to make calls and listen to music through the car stereo. Compatible with Most Bluetooth Enable Device - Smartphone, Tablet etc.