Awesome Brightness: Each tail light has 10 PCS high-quality SMD LEDs to output super bright red light, high brightness of Turn/Brake light, low brightness for Taillight, improving visibility and ensuring you a safer night.Easy Installation: The taillight comes with grommets for surface mount, also added a 3-prong watertight plug with attached wire. For installation, you just need to surface mount the grommets & light setup, and then connect the 3 wires to the corresponding wires on vehicles. Hole size for surface mount is: 6. 6” x2. 5” x 1. 75”Upgraded Unique Design: Niligh's tail light has unique “ears” on its two sides, upgrade notches on the inside of grommet, and a tighter attaching ability between 3-prong plug and it. These help the light fit perfectly and firmly on the grommet, and the 3-prong plug attaches tightly on the light. Shake proof, there will be no worries of loosing light or wiresReady For The Weather: Be highly silicon sealed, IP67 waterproof rating, always be ready for different kinds of weather attackUniversal Application: Work on a 12 V DC system, function as turn/Brake light, tail light for all kinds of trucks, trailers, tractors, semi-trailer, horse trailer, travel trailer, dump Truck, special vehicle, etc. Just make sure the hole size before you purchase.Fit Type: Universal Fit. 2 Years Warranty Honored by Nilight. Note: Please charge the device before using. Tail light size with grommet: 7.5”*3.3”*1.75”