This light is a tough, waterproof, super-bright alkaline battery-powered flashlight with one high-intensity C4 LED. The Propolymer series of flashlights is impact and shock resistant, can run for 4 hours at maximum output, and is waterproof, made from a non-corrosive plastic. The Streamlight Propolymer Luxeon is the optimum choice for those harsh environments when you need maximum output from a durable light the most.