1. In transmitter mode, turns a non-Bluetooth TV, PC, CD player, MP3/MP4 into a Bluetooth transmitter. Receiver mode: Ideal for home or vehicle music streaming audio systems. 2. Simply connect this Bluetooth audio receiver to the line-in or auxiliary input on your speakers, pair it with your Bluetooth-enabled device, and enjoy wireless audio streaming. 3. Use Bluetooth functionality in your car, home theater system, kitchen, bathroom, bedroom, or other areas. 4. Supports audio codec for enhanced sound quality. Delivers high-quality audio performance. 5. Features a high-performance Bluetooth IC with wide compatibility. Powered by a built-in rechargeable lithium-ion battery via mini USB port, offering extended operation time and low power consumption. Includes built-in microphone for hands-free calling in car use. Power On/Off: Power on: Press and hold the ON/OFF button for 5–7 seconds until a “ready to connect” prompt or sound is heard; automatically connects to previously paired device. Power off: Press and hold the ON/OFF button for 4–5 seconds until a long beep or red LED indication is observed. Connect the receiver to your speakers: Use a 3.5mm male-to-male audio cable to connect the receiver to your speakers (ensure full insertion if no sound is detected). Interface: USB Interface: 3.5mm Wireless Type: Bluetooth Content: Audio Sound Track: Dual Supports AAC: Yes Supports Apt-X: Yes Color: Black Material: ABS Package Contents: 1 x USB Bluetooth Audio Adapter 1 x AUX Cable Note: Light and display differences may cause slight variations in color between the image and actual item. Measurement error allowed is +/- 1-3 cm.