Operating Instructions: 1. Insert the Bluetooth FM transmitter into the car cigarette lighter. 2. Turn on the car radio and turn the FM radio to any blank channel. (Note: Avoid local channels.) 3. Adjust the Bluetooth FM transmitter's frequency to the same frequency as the car radio. 4. Now, you can pair it with your phone via Bluetooth for music or hands-free calls. Specifications: Rated Working Voltage: 12V~24V USB1 Output: 5V/1A USB2 Output: QC3.0 Support Music Format: MP3/APE/WAV/FLAC Support U Disk/ TF Card Capacity: 1G~32G Bluetooth Version: 5.0 Bluetooth Audio Processing: DSP/A2DP Frequency Range: 87.5 -108.0 MHz Package Contents: 1 * Bluetooth FM Transmitter 1 * User Manual