The Optronics STL201XRFHXBP is a 4 inch round stop/turn/tail light with back-up light and reflex mounting flange. The Optronics Fusions series is patented technology. The light is sonically sealed, waterproof. FMVSS compliant for over 80" applications. 20 diodes total, 16 red and 4 white. It is hardwired with 8" leads and ground. Lifetime LED Warranty.