This Car FM Transmitter allows you to listen to the MP3 music saved on your USB flash drive in your car, truck, boat or RV.Without taking high investment, you can enjoy nice music while you are driving. Made of high quality materials, this car MP3 player FM transmitter is durable and reliable enough for long time using. With multi-functions, you could input all your favorite music inside the car MP3 Player FM Transmitter. Simply plug the car MP3 player FM transmitter into your car's cigarette lighter socket, then turn on your car stereo and turn to the same frequency! Plug in an SD card, USB flash drive, and even an MP3 Player and listen to your favorite music on the go!This Car MP3 Player FM Transmitter with SD MMC USB Port is ideal for your needs.