Functions: Functions as Marker Light, Side Marker Light, Turn Light, Turn Signal Light, Turn Flow Light, Sequential Turn Signal Light, Running Light, Tail Light, Clearance Marker or Identification light, etc Utility&Brightness: Newly upgraded taillight has two amber lighting functions: Marker Running Light is constant light with 60% low brightness. Sequential Turn Signal Light is turning signals with 100% high brightness, which can alert the rear vehicles and people to avoid and ensure safety Easier to Install after Upgrading: Surface mount. Left and right outward lead wire notch design can avoid opening wire holes. Glue seals the wire outlet to prevent short circuit. 3-wire connection: Black is Negative; Red is Marker Running Lights; Amber is Sequential Turn Signal Lights Features: Ultra-slim Line LED Strip Signal Lamp with Smoked Lens, Super Brightness 15 Diodes LED Combination with Better Heat Distribution, Material: ABS Housing & Sealed Polycarbonate Lens, Dust-proof, IP67 Waterproof Applications: For use on Heavy Duty Trucks (Peterbilt Freightliner Kenworth Mack Western Star), Semi Trailers, Cargo Trailers, Boat Trailers, work Vehicles and a Wide or Narrow Overland Vehicle Requiring Quality DOT Rated Lighting, Van, Bus, Pickup Package: Included 2 x LED Tail Lights, 4x Screws, 4x Screws Caps