Bluetooth Transmitter/Receiver Product Function Introduction 1. Used for Bluetooth audio transmission in car stereos, older stereos, computers, , and other devices. 2. Supports hands-free calling. 3. Supports Type-C charging. Technical Parameters: Bluetooth Version 5.3 Operating Voltage 5V Bluetooth Transmission Distance 5-10 meters Bluetooth Calling Effective Distance 0.5-2 meters Instructions for Use (Version with RX/TX Switch Buttons) 1. Power Consumption When Off: 67µA, Bluetooth Search Name: M-168 2. Long to power on or off. Double to redial. 3. Short : Previous track, short : Next track / Long : Volume up, long : Volume down. 4. Switch the button to TX for transmit mode; switch the button to RX for receive mode; transmit mode: AUX input stereo; TF card transmit stereo, computer sound card stereo. 5. Receive mode: Blue light flashes when powered on; RGB lights up simultaneously when connected successfully. 6. Transmit mode: Green light flashes when powered on; RGB lights up simultaneously when connected successfully. 7. Red light indicates charging; red light is on when charging, off when fully . Color: Black Material: ABS Package Contents: 1 * Adapter Only the above package content, other products are not included. Note: Light reflection 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.