SureFire Defender Series LED Flashlights with Strike Bezel Two output levels: 600 lumens high for maximum light, 5 lumens low for extended runtime TIR lens produces tight beam with enough surround light for peripheral vision Coated tempered window resists impact, maximizes light Dual-output tailcap click switch: press for momentary-on high, click for constant-on high, return to off then press or click again to select low High-strength aerospace aluminum body, Mil-Spec hard-anodized for extreme durability