1. Plug this unit into cigarette lighter outlet

2. Plug U flash Drive which contain MP3 music files or MP3 player into the USB jack of this unit

3. Adjust channel according to the back attached frequency list

4. Turn on the Car FM Radio, adjust its channel corresponding to this unit. While press "play" button, the wonderful MP3 music coming out from Car sound box.

5. If there have signal interference, adjust the channel according to the attached frequency list (optional 7 frequencies) until there haven't interference. Then you can keep this channel with memory function in Car FM Radio in order to use it convenient next time.

6. Press>>‖: Play/Pause， Press slightly: Next, Push >>for over 3 seconds to turn up the volume .