August CR100 FM Transmitter with 3.5mm In / USB Port / Card Reader - In Car MP3 Player for Smartphones and Tablets - Apple / Android / Blackberry Compatible Car MP3 player and FM transmitter plays and transmits music to your in-car stereo system Play MP3 files via the built-in SD/MMC card reader & USB port Transmit music from MP3 players with USB or 3.5mm audio output socket 206 selectable channels with Up/Down frequency scan buttons Powered by the cigarette socket of any car, lorry and boat with DC12/24V output