1. In Transmitter mode, turn a non-Bluetooth TV, PC, CD player, for for , MP3 / MP4 into Bluetooth transmitter. Receiver mode: Perfect or vehicle music streaming . 2. Simply connect this bluetooth audio receiver to your line-in or auxiliary input on your speakers, pair it to your Bluetooth enabled device, and enjoy the wireless music revolution. 3. Whether you Bluetooth in your car, through your home-theater system, in your kitchen, bathroom, or bedroom,etc. 4. audio codec for a richer and sound experience. Listen to CD-like audio quality at no compromise. 5. Powerful bluetooth IC,More stronger compatibility. Powered by built-in rechargeable - battery via mini USB port , long working time and low consumption. ( included) You can through your car and phone call via the built-in Mic. 1.Power on/off Power on: Press and hold the ON/OFF button for 5-7 seconds hear a " for connecting or a sound", it will auto connect the phone which paired. Power off: Press and hold the ON/OFF button for 4-5 seconds hear a "Long be or red led". 2. Connect the receiver to your speakers With 3.5mm Male to Male Audio Connector or 3.5mm Male to Male Audio Cable to connect the speakers and the receiver (if no sound, make it inserted completely). Interface: USB Interface: 3.5mm Wireless Type: Bluetooth Content: AUDIO Sound Track: Double Support AAC: Yes Support -x: Yes colour:Black Material:ABS Package Contents: 1 x USB Bluetooth Audio Adapter 1 x AUX cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.