These 4 inch round LED lights contain ten (10) highly visible LED's. The RecStuff line of trailer LED Trailer Lights are easy to install. It mounts into the included grommet, and contains the pigtail wires. LED trailer lights respond instantly and are visible from a further distance than the traditional incandescent bulb providing a safer ride for you and the vehicle behind you. LED lights consume 10 times less power, provide longer life, and provide optimal visibility. The LED trailer light is a spectacular upgrade to perform with minimal cost.