Features 1. The transmission/reception function can be switched 2. Full texture and exquisite appearance 3. The product is compact and has a wide range of applications 4. Non destructive sound quality 5. Press the button to answer and make hands-free calls 6. Built in battery for long-lasting battery life 7.5.3 Bluetooth version, no lag Parameters Product Name: Bluetooth Audio Adapter Model: C25 Audio decoding: SBC Supporting protocols: HSP, HFP, A2DP, AVRCP Transmission range: 10m Product input: 5V/1A Input interface: AUX Product size: 72mm * 57mm * 14.8mm Product material: ABS Bluetooth version: 5.3 Transmission distance: 10 meters Battery capacity: 250mA Charging interface: Type-c Usage: Plug and play Function: Transmission/reception Battery life: about 13-17 hours [combined with different usage methods] Working frequency: 2.4G (MHz) Transmission speed: 2.4 (Mbps) Pairing operation 1. First, insert the adapter into the headphone jack of the entertainment device you need to connect to, and then long press the multifunction button to turn it on; 2. Push the mode button to TX, and the red light flashes to indicate that it is in a waiting state for pairing; 3. Turn on the Bluetooth earphones and adjust to Bluetooth pairing mode; 4. After successful connection, the red light flashes slowly. (The first connection may take a few seconds, and it will automatically connect the next time after a successful connection.) Note: After Bluetooth pairing is completed, double-click the multifunction button to search again; If pairing fails, you can turn off the power and then restart the Bluetooth adapter and Bluetooth earphones/ Bluetooth speaker, repeat the above steps, and then try a few times; If you are using this product on a TV, please confirm which RCA interface is the audio output port. equipment Need to connect to RCA or 3.5mm audio output port instead of audio input port. Product List: Bluetooth adapter * 1 3.5mm audio pin * 1 Charging cable * 1 Instruction manual * 1