With remote control car subwoofer 4 inch 1.Support USB, SD & MP3 ... Good quality and competitive price With remote control car subwoofer 4 inch CH-2012CSpecifications:1) With5 inch car ... ) Embedded amplifier, shows us a professional amplifier and subwoofer, which makes subwoofer smart, fashionable and perfectly. 3) Support USB, ... , compatible mp3 format With remote control car subwoofer 4 inch CH-2012C