Each marker lights built-in 24pcs high power SMD LEDs, Output super bright light, Outfitting your trailers with this LEDs will allow other drivers to see you better at night，improving driving safety. Ultra thin design, Small low profile but intense brightness, Surface mount, Come with zinc plated mounting screws and nuts, can place almost anywhere so installs are easier and lend to locations that reduce the likelihood of collision and impact damage. With 3 wire design, white wire for ground, red wire is high brightness and as reverse/back up light, black wire is low brightness and function as running light.Universal fit for trucks, trailers, motorcycle, tractors, lorry, van, caravan, RV, Camper and buses etc