Promate FM12 is Wireless FM Transmitter that helps you can listen to MP3 files in your car via an SD or MMC card slot or USB flash memoryfm12. Multi-functional car style FM transmitter supports 206 FM channels and has an SD/MMC card slot and a USB port so you can listen to your MP3 files on the road. Combined with 20 key remote control and interactive LCD Display, simply plug into your car, turn on your car stereo and tune up. Plug in a SD/MMC card USB flash drive and even an MP3 player and listen to your favorite music on the go.