High Impact & Vibration resistant. Drainage slots in four corners for moisture on the exterior frame. Tested to minus 40 degree to plus 50 degree. Easy installation and maintenance. Spring loaded socket assembly. Soft Neoprene gasket which creates optimum seal. Rugged extruded aluminum housing with cast end caps. Available in both 2 & 4 foot models. Easy to maintain existing lighting systems by not changing the overall design.