Application: For fender functions as clearance lights and red rear marker lights for trailer applications over 80 inches wide. Installation: Pre-wired assembly mounts to the top or side of the fender to mark the widest point of the trailer. Features: Weatherproof and corrosion resistant; Replaceable lenses and bulbs. Connection: Red is positive and black is ground. Material: ABS Color: Black Package Contents: 2 x Trailer Lights Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.