This product is designed for use in vehicles and features the latest Bluetooth 5.1 technology combined with reliable FM transmission, allowing users to enjoy wireless music playback in the car.Specifications: 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: 95dB Call receiving: Supported Auto return: Supported Power supply: USB power supply (5V) Features: USB interface: Provides power via USB connection. Simply plug the device into any standard 5V USB port, such as those found in cars or through a car charger adapter.Instructions: 1. Plug into the USB port Insert the FM01 into a USB port to power on. The blue LED will illuminate. Press the button to adjust the frequency; default is set to 95.0 MHz. 2. Match car FM frequency with device Turn on your phone's Bluetooth settings and search for the pairing name FM01. Once paired successfully, the blue light will stop flashing. 3. Sync car radio frequency Turn on your car stereo and tune it to the same frequency as the FM01 (e.g., 95.0 MHz). 4. Play audio Begin playing music or navigation audio from your mobile device. Note: Setup is required only once. Subsequent uses will automatically connect via Bluetooth and FM. Package includes: 1 x USB Bluetooth 5.1 FM Transmitter 1 x Instruction manual