Partsam 2pcs 4" Round White 24 LED Truck Trailer Light Reverse Backup Running Light + Chrome/Wire Partsam ( 2 x White ) 4" Round Led Truck Trailer Lamp--reverse backup running Light, with 24pcs high power LED inside. Application: Trucks,trailers (Boat, Box, Camper, Transport), 4WD, Caravans, Motor Homes, Boats / Marine, Earthmoving & Mining Equipment, Forklifts, Buses and Coaches, Camping, Fishing. Function as back up light, reverse light and running light. EASY TO INSTALL: Black Wire is the Ground; Red Wire is the high brightness; White Wire is the low brightness. Offering customer technical service, feel free contact us for technical, installation and use question. It all started in the summer of 2013 with a simple, with bold idea: make better auto parts. In other words, not just a better auto parts - a better way of doing things. A new kind of auto company that works hand in hand with users to do something amazing, something meaningful. Now PARTSam has grown tremendously to become one of the leading platforms of e-Commerce in the aftermarket auto parts industry. Inventory Management/Warehouse &amp; Fulfillment  With our warehouse located in Milpitas, California, we take care of the inventory management for our products. This saves manufacturers space, time, and headache. Automated Multi-Channel Sales  We successfully advertise our products on multiple platforms and maintain top-rated healthy seller accounts, which keep customers drawn to our products. We are continually expanding our customer base as we add more sales channels. Professional Seller - Customers will deal directly with us in regards to issues and concerns they experience with the products. Manufacturers will not have to deal directly with the individual customers, but will experience the benefits of their business, which is the typical win-win cooperation. Universal for Trucks,trailers,tractors,semi-trailer,Dump Truck,bus,boat,special vehicle,etc. For Heavy Duty trucks like Kenworth Peterbilt Freightliner Western Star Volvo International Mack Paccar and other Truck lights Size: 6&#039;&#039; (outer) x 4&#039;&#039;(inner)&#039;&#039; x 1.55&#039;&#039;; Function as Stop Turn Tail Backup ReverseLights &amp; auto marker lights, waterproof lens, chrome rings included. These Lights are impact resistant and less susceptible to shock damage. Each LED Light is water-tight sealed. These LEDs draw less current, generate less heat and are brighter and light faster than an incandescent bulb. Package include:2pc White4 inch Round Chrome Rings with 24pcs high power LEDs ClearCover Stop/Turn/Tail BackupLight.