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-Return Function: Supported Power Supply: USB (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 control, and track navigation Interface and Controls: USB Interface: For power supply only. Compatible with any 5V USB port, such as those found in vehicles or car chargers. Multi-function M Button: - Long press to enter FM frequency adjustment mode; screen flashes. Use '+' and '-' buttons to adjust frequency. Press M button again to confirm. - Single press to play/pause audio playback. - Single press to answer an incoming call. Multi-function '+' and '-' Buttons: - '+' Button: - Single press: Skip to next track - Long press: Increase volume - In FM adjustment mode: Adjust FM channel (short or long press) - '-' Button: - Single press: Skip to previous track - Long press: Decrease volume - In FM adjustment mode: Adjust FM channel (short or long press) Setup Instructions: 1. Plug the FM02 into a 5V USB port in your vehicle. 2. Use the M button to set the desired FM frequency. Then tune your car radio to the same frequency. 3. FM02 remembers the last used frequency and defaults to it upon power-up. 4. Enable Bluetooth on your mobile device and pair with “FM02”. Once connected, audio from your phone will play through your car speakers. 5. For optimal sound quality, set your phone’s volume to maximum and adjust your car’s volume to a moderate level. Avoid excessive car 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 supported range. 2. Some vehicle models cut power to the built-in USB port when the radio is turned on. In such cases, use a 5V car charger or cigarette lighter adapter instead. 3. In certain factory-installed vehicle systems with USB ports, performance may be suboptimal due to interference. A dedicated 5V car charger is recommended. 4. This device does not auto-power-off. Unplug it when not in use. 5. If the device does not appear in your phone’s Bluetooth list or fails to pair, clear previously paired Bluetooth devices from your phone, restart your phone, and try again.