The Blazer B669BU 3-1/4" round back-up light is designed to conform to applicable U.S. FMVSS108 and Canadian CMVSS safety standards and meet DOT requirements for back-up lighting. The 12V light is surrounded by a polished chrome-plated brass housing and durable polycarbonate lens. A gasket is included for a weather tight seal against the elements. The light surface mounts using the 4 holes on the back of the light. The light contains a single wire design and grounds through the mounting hardware.