The ProClass LED Red Light Bar can be used as a clearance or side marker light on your trailer. It increases visibility to notify other drivers of your trailer you are towing. The clearance light grounds through the white wire and has an additional wire to connect to a DC power supply. The high visibility LED light lasts up to 100,000, hours which far exceeds standard incandescent clearance lights. Features a weld free, single lamp design. The clearance light is constructed of durable plastic corrosion-resistant housing to withstand extreme weather.