Product Specification: Product Name: USB Bluetooth FM Transmitter Product Model: FM02 Bluetooth Version: V5.3 Working Voltage: 5V Effective Range: Up to 10 meters Audio Output: FM Transmitter FM Frequency Range: 87.5 MHz – 108 MHz Default Frequency: 95.0 MHz Signal-to-Noise Ratio: 95 dB Call Answering: Supported Auto-Reconnect: Supported Power Supply: USB power supply (5V) Package Includes: 1 x USB FM Transmitter Features: 1. Bluetooth version upgraded to Bluetooth 5.3 2. Built-in display screen 3. Three control buttons for FM channel adjustment (87.5–108 MHz), volume up/down, and track navigation Interface and Controls: USB Interface: For power supply only. Connect to a 5V USB port, such as a car USB port or a 5V car charger. Multi-function M Button: - Press and hold to enter FM frequency adjustment mode; screen flashes. Adjust frequency using '+' and '-' buttons. Press M button again to confirm. - Press to play/pause audio playback. - Press to answer incoming calls. '+' Button Functions: - Press to skip to next track - Press and hold to increase volume - In FM adjustment mode: press to increment frequency; press and hold for faster adjustment '-' Button Functions: - Press to go to previous track - Press and hold to decrease volume - In FM adjustment mode: press to decrement frequency; press and hold for faster adjustment Instructions: 1. Plug the FM02 into a 5V USB power source in your vehicle. 2. Use the M button to set the desired FM frequency. Then tune your car radio to the same frequency. 3. The device remembers the last used FM frequency and defaults to it on power-up. 4. Enable Bluetooth on your mobile device and pair with “FM02”. Once connected, audio from your phone will broadcast through your car speakers. 5. For optimal sound quality, set your phone’s volume to maximum and adjust your car stereo volume to a moderate level. Avoid excessive car stereo volume to minimize noise and distortion. Precautions: 1. Default FM frequency is 95.0 MHz. If interference or noise occurs, select another frequency within the 87.5–108 MHz range. 2. Some vehicles disable power to the built-in USB port when the ignition is off or when the radio is powered on. In such cases, use a 5V car charger plugged into the cigarette lighter socket. 3. Compatibility may vary with factory-installed USB ports. For best performance, use a dedicated 5V car charger. 4. The device does not auto-power-off. Unplug when not in use. 5. If the device is not discoverable or fails to pair, clear previously paired Bluetooth devices from your phone, restart the phone, and retry pairing.