This is a ROKKER self-powered subwoofer kit for the Vanderhall 3-wheel Roadster. Kit includes a 200w RMS self-powered subwoofer that is mounted in the very back of the rear storage compartment to provide deep throbbing bass response to further enhance the overall audio experience. Custom made plug-n-play wiring harnesses are included with this subwoofer add kit, top quality heavy gauge power/ground wires are used for the fused battery connection, along with all necessary mounting hardware & complete installation instructions.