Submersible to 500 feet. Patented super-bright Xenon laser-spot penetrates water, fog and smoke. Batteries are protected against shocks and hard abuse. Automatic purge valve allows internal gas to escape without sacrificing watertight integrity. 12,000 candle power. Uses 3 C-cell alkaline batteries (not included). Size: 7.5" L x 1 7/8" Dia.