1. In Transmitter mode, turn a non-Bluetooth TV, PC, CD player, for for , MP3 or MP4 into Bluetooth transmitter. Receiver mode: Perfect for home or vehicle music streaming sound system. 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 want Bluetooth convenience in your car, through your home-theater system, in your kitchen, bathroom, or bedroom,etc. 4. AptX audio codec for a richer and deeper sound experience. Listen to CD-like audio quality at no compromise. 5. Powerful bluetooth IC,More stronger compatibility. Powered by built-in rechargeable li-ion battery via mini USB port , long working time and low consumption. (Mini USB cable included) You can play music through your car and answer phone call via the built-in Mic. 1.Power on or off Power on: Press and hold the ON or OFF button for 5-7 seconds until you hear a "ready for connecting or a sound", it will auto connect the phone which was paired. Power off: Press and hold the ON or OFF button for 4-5 seconds until you 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, Please make sure it was inserted completely). Interface: USB Interface: 3.5mm Wireless Type: Bluetooth Content: AUDIO Sound Track: Double Support AAC: Yes Support Apt-x: Yes colour:Black Material:ABS Package Contents: 2 x USB Bluetooth Audio Adapter 2 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.