Enjoy favorite music in a long trip when drive for a long way has never been so easy. Car FM transmitter doesn't require any CD or DVD, small size, easy installation. Users just need to store their favorite songs in MP3 format into a USB flash drive or SD/MMC memory card, insert into this FM transmitter, plug into car cigarette lighter, choose broadcast frequency, tune car FM radio to the same frequency, press PLAY button, the rest thing is enjoy the music.