SallyBest&reg; 2 Channels Mini Hi-Fi Digital Motorcycle Auto Car Stereo Power Amplifier Sound Mode Audio Music Player Support USB FM SD DVD MP3 Imported high-quality power amplifier IC, HIFI sound. With USB / SD interface, can play MP3 audio files directly , external high quality RCA inputs for connecting CD / DVD or computer and other sources. With FM radio function, digital display. Input voltage:DC 12V. Treble bass volume independent regulator with remote control, more convenient. Colorful dynamic LED level display, suitable for car and motorcycle.