Car Digital Music Changer USB SD MP3 for MAZDA 3 5 MX-5 CX-7 Protege MPV Tribute Original car CDC port set aside, simple and quick to install Built-in high quality (18 bits, low noise) MP3 / WMA Decoder,WAV Supports USB Stick / SD / MMC card / flash drive / mass storage device / external harddrive Higher than CD quality sound of your MP3 files with level-matching technology Full control over the music via steering wheel or head unit controls