Features:This is a audio car kit. It is a replacement of CD charger. It can be easily installed and used. The installation and usage are the same as CD changer's installation and usage. Simply plug in USB disk/SD card or iPod iPhone or android， you can play audio through car audio system and enjoy music in your carDirect connection via CD charger port with CD quality sound Control music files from your car radio panel or steeringSupport USB flash， SD card or iPod iPhone or android and 3.5mm jack inputBuilding in high quality MP3/WMA decoderBuilding in amplifier chipsNo signal interface， no battery requiredSmart design and easy to install and useSpecification:Voltage Input: 12V DCSignal-to Noise: 95DBMax.Current: 600MAMax.Voltage output: 12VD/A Device: 24BIT 192KHZTotal Harmonic Distortion: 0.01%Frequency Response: 20HZ-20KHZPackage Included:1 x 3.5mm Car MP3 Interface Adapter AUX In Input