Multi-Functional Lighting: These versatile LED lights can be used as parking lights, rear turn signals, brake stop lights, side marker lights. Each light features 60 ultra-bright LEDs (24 amber on the front, 24 red on the back, and 12 amber on the sides) for visibility day or night Easy 3-Wire Installation: Universal 3-stud connection with simple wiring: white (ground), white + black (low brightness), and white + red (high brightness) for flexible brightness control Dual Colors: Features front amber and rear red LEDs with additional side warning lights to alert drivers in adjacent lanes, promoting safer lane changes and reducing rear/side collision risks Chrome Visor: Reinforced chrome visors provide extra waterproofing, shielding the lights from rain, snow, and road spray while enhancing durability Durable & Waterproof: Built with a sealed, high-impact lens and housing to resist water, dust, and harsh weather. This double semi truck lights is widely fit for 10-30V vehicles, such as Peterbilt, Freightliner, Kenworth, Western Star, International, Mack, etc