Partsam 2pcs 4" Round LED Trailer Tail Lights - 40 White LED Reverse Back up Trailer Lights for RV Jeep Trucks, Waterproof Sealed Round led Reverse Fog Lights Flush Mount for Truck Trailer Boat Bus Partsam (2 x White) 4 inch Round /40 LED lamp function as Stop Turn Tail and Brake Backup Reverse Lights. Application: Trucks,Trailers (Boat, Box, Camper, Transport), 4WD, Caravans, Motor Homes, Boats / Marine, Earthmoving & Mining EquipmentForklifts, Buses and Coaches, Camping, Fishing Dimensions: 4 inches; LED Quantity: 40 Diodes; Clear Lens White Light. Outer diameter: 137mm (5.4''); Inner Diameter: 100mm (3.94''); Height: 35mm (1.4'') EASY TO INSTALL: 3 Wire Connections - Black Wire is the Ground; Red Wire is the high brightness; White Wire is the low brightness. 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 Applications: For any 12V Vehicles, Any applications on vehicles, esp. truck trailer RVs etc.