SureFire High-Output LED Wrist Light, Black Virtually indestructible LED emitter regulated to maximize output and runtime Three output levels  high of 180 lumens, medium of 60 lumens and a low of 15 lumens Tactical-level output shaped by refractive optic creates diffused beam perfect for close-range applications Ergonomic, ambidextrous pushbutton switching ConstructionHigh-strength aerospace aluminum with Mil-Spec anodizing; adjustable nylon wristband with O-ring-type strap