The Smith & Wesson Delta Force CREE XPE2 LED Tactical Flashlight operates on two CR123 lithium batteries. For easy use, a holster is included. Flashlight has 204 lumens, with a runtime of two hours, and 58 minutes. The beam will go a distance of 204.4 meters. Also waterproof to one meter, and extreme weather and impact resistant for the hard user. ANSI FL1 certified.