The ATAC L2 Tactical Flashlight is the most powerful light in the 5.11 ATAC family with industry-leading performance for a two-Lithium battery power source. Powered by just 2 CR123A batteries, the ATAC L2 Tactical Flashlight throws an ultra bright 222 ANSI FL1 Lumens of light in a smooth tactical beam pattern. Provides 4 hours of runtime on its high setting and 74 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-on 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.