GTMax 3 in 1 SD/MMC/USB/MP3 Wireless In Car FM Transmitter with Remote for iPod Shuffle 4 4th Gen, Nano 7 6 5 7th 6th 5th Gen 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