Perfect as an extra brake light…or when the addition of a cap blocks existing light. Mounts to the upper or lower part of window frame (brackets, screws and double-sided tape included). Gives extra warning to drivers behind you…helps prevent rear-end collisions. Black polycarbonate housing (approx. 6-1/2"W x 1-1/2"H x 1-3/8"D) with 2 easy-to-replace bulbs. Tough red Lexan® lens won't break or fade. Includes hardware and instructions. For 12-volt negative-ground systems. Order logic circuit separately. Logic Circuit. For vehicles without OE third brake light or vehicles without separate brake and turn signal lights. 3-wire hookup. Includes instructions.