GTMax 3 in 1 SD/MMC/USB/MP3 Wireless In Car FM Transmitter with Remote for Apple iPhone 5, 4S, Pod Touch 5th, iPod Touch Nano 7th, iPad Brand New SD/USB/MP3 Wireless In Car FM Transmitter with Remote In Car Cigar Plug style (12V) USB interface Supports SD/MMC card Reads MP3 files LCD display Earphone jack Buttons: Previous button Next button Start/Pause button FM Frequency down FM Frequency up, support 206 FM Channels. LCD Show the Volume and Ordinal Number of Song, power off still have memory