The ATAC L1 Tactical Flashlight is a powerful compact light with industry leading-performance for a single Lithium battery power source. Powered by just 1 CR123A battery, the ATAC L1 Tactical Flashlight throws a brilliant 173 ANSI FL1 Lumens of light in a smooth tactical beam pattern. Provides 2 hours of runtime on its high setting and 46 hours of runtime on its low setting. The tactical Intelligent Switch is designed to silently cycle through all 3 light modes (High/Low/Strobe) using only the momentary function to prevent a "click" sound from giving away your location. The rotary Dial Lock-Out Switch allows you to instantly lock or unlock the light with just one hand using your thumb to prevent inadvertent activation. Break-Away lanyard is designed to free your arm from the flashlight in the event of an emergency.