This Incandescent Left Hand Trailer Brake Light features a sealed, waterproof construction, so its fully submersible, making it a great choice for Boat or jet ski trailers. The Rectangle Trailer Brake Light performs 7 functions, which include: Stop, Tail/running lights, side reflector, rear reflector, and rear clearance. There are 3 pre-installed wires which are Brown (Power/running), white (ground) and yellow (Turn). This version of the Rear Trailer Brake Light is meant to be installed to the Left Hand Side, or driver side of the trailer. This is because this light includes the lower License Plate Illumination Light, and the Side Marker Light faces the road when installed on the Left Side.The Lens is removable, so you can replace the Incandescent Bulb. The Light can be mounted onto studs that are spaced 2 inches or 4 inches apart. The entire Brake Light Measures about 8 inches Long x 3 inches wide and 3 inches tall.Features: - Submersible Incandescent Light (Left)- 7 Function Light- 8" x 3" x 3"- Stud Mount, 2 inches or 4 inches center to center