Yatour Car Mp3 Radio Player Adapter Cd Changer for Mazda 2/3/5/6/323/cx7/rx8/mx5 Connected with wire harness, not FM signal controlled, high quality sound guaranteed Controlled by car Head Unit, support Steering Wheel operation With imported Decoding Chip, perfectly support MP3 and WMA music tracks Supports SD/SDHC/MMC Card/USB Stick/Card Reader/Hard Disk Supports external audio source (MP3, MP4, PSP, mobile phone) via AUX IN slot