Features: *1. Adopt the latest Bluetooth-compatible 5.1 technology and mature FM technology, allowing driver and passengers to easily enjoy wireless music in the car. *2. Powered by 5V USB port, like the USB port in the car, or the USB port on car charger adapter. *3. Available in 3 FM frequencies, and with independent indicator lights to show the current frequency. *4. Easy to operate with just one button. Multi-function Button: *1. To adjust the FM frequency, after the product is powered on, before Bluetooth-compatible pairing, click the button to change the FM frequency (87.5MHZ, 95.0MHZ, 103MHZ can be selected) *2. When a song is playing, click the button to pause and play. *3. Answer the call: When someone calls in, you can click the button to answer the call. How to use: *1. Plug the FM01 into the USB port in the car with an output voltage of 5V. *2. Set the FM frequency band by clicking the button, then turn on the car radio, and tune the FM frequency band of the radio to the same as that of FM01. *3. FM01 has FM frequency automatic memory function, each time it is powered on, it will default to the FM frequency when it was last used. *4. After the FM frequency band is set, find the Bluetooth-compatible pairing name: FM01 in the phone settings, and click to pair. *5. Adjust the volume: When you play music, you can adjust the music volume. It is not recommended to turn up the car volume too much, because the louder the car volume, the more serious the noise and distortion will be. Description: *1. Model Number: FM01 *2. BT Version: V5.1 *3. Working Voltage: 5V *4. Effective Distance: within 10 meters *5. Audio Output: FM transmitter *6. Default Frequency: 95.0MHZ *7. SNR: 95db *8. Answer the Call: support *9. Automatic Call Back: support *10. Power Supply: USB(5V) Package Includes: 1 x Bluetooth-compatible FM Transmitter