I am selling it because I no longer need it due to changing cars. There is no instruction manual. (I was able to download it by searching on the internet) Please purchase this product if you have knowledge of wiring and understand that it is a used product. "KSC-SW11 KENWOOD tune-up subwoofer system KENWOOD" JVC Kenwood Model number: KSC-SW11 Car tune-up subwoofer system #JVCKENWOOD #KSC-SW11 #Interior/Home/Daily necessities