FDL Car Fm Transmitter Modulator Player Mp3 Player - Blue Brand new and high quality generic Car FM transmitter modulator for Mp3 player, pen drive, SD MMC card Built-in USB port. Save your favorite songs( MP3 /WMA format) in any audio device with USB port such as Flash drive, MP3 player, etc. Just enjoy them with this transmitter in your car Easy & convenient. Built-in SD/MMC card slot. Support SD/MMC expansion card (Up to 8GB). pls adjust to the same frequency with the fm, then can broadcast Built-in FM transmitter. Support frequency range from 87.5MHz-108MHz. pls adjust to the same frequency with the fm, then can broadcast.