This product is designed for use in automotive environments and features the latest Bluetooth 5.1 technology combined with reliable FM transmission, enabling users to enjoy wireless audio playback in their vehicles. Specification: Product name: USB Bluetooth FM transmitter Product Model: FM01 Bluetooth version: 5.1 Operating voltage: 5V Effective range: within 10 meters Audio output: FM transmitter Default frequency: 95.0 MHz Signal-to-noise ratio: ≥95 dB Call reception: Supported Auto reconnection: Supported Power supply: USB power supply (5V) Features: USB interface: Provides power through a standard USB connection. Connect the device to any 5V USB power source, such as a vehicle's built-in USB port or a car charger adapter. Instructions: 1. Plug into the USB port Insert the FM01 into a powered USB port. The blue LED will illuminate upon power-up. Press the button to adjust frequency; default is set to 95.0 MHz. 2. Match car FM radio frequency Turn on your vehicle’s FM radio and tune it to the same frequency displayed on the device (e.g., 95.0 MHz). 3. Pair mobile device via Bluetooth Enable Bluetooth on your smartphone and search for the device named "FM01". Once paired successfully, the blue light will stop flashing. 4. Play audio Begin playing music or navigation audio from your mobile device. The sound will transmit wirelessly through the car’s FM radio. Note: Initial setup is required only once. Subsequent uses will automatically reconnect via Bluetooth and FM. Package includes: 1 x USB Bluetooth 5.1 FM Transmitter 1 x Instruction manual