Streamlight Propolymer White LED

3, 100,000 hours LED's never need replacing. Corrosion and impact resistant. Intergral pocket clip. Waterproof. 20 times longer battery life than standard flashlights. Up to 120 housrs of run time. Push button switch. Uses 3N size batteries. Looks like C or D cell but only 1 in. long about 1/2" wide. The light itself is 5 1/4" long.