FM Transmitter which could upgrade your FM Car Stereo to an MP3 player. * Play MP3 files stored on USB Flash Drive, USB Card Reader with Flash Card, MP3, iPod and CD Players. * 7 FM broadcast frequencies available * Powerful broadcast frequencies for disturbance-free music * Sturdy and Trendy design, Compatible with USB1.1 or USB2.2 Flash Drives, USB Card Readers, MP3, iPod and CD Players.