Nitecore's Super-compact T2S is durable enough to withstand every-day punishment yet compact enough to fit on a keychain or lanyard. The single AAA powered light is capable of producing 50 lumens. A machined HA III military grade anodized aluminum makes this a truly rugged device. Three levels of brightness plus a warning signal are accessible by simply turning the bezel. The T2S comes with an attachable stainless steel pocket clip.Features and Specifications: Compact and portable High efficiency digital driver circuit Maximum runtime of 28 hours in low mode Three levels of brightness plus warning signal Constant current (not PWM) Convenient one-handed operation Reverse polarity protection Removable stainless steel clip included LED: CREE XP-E (R2) Maximum output: 50 lumens Runs on: One AAA battery (Battery not included) Aluminum reflector ensures a balanced beam profile Toughened ultra-clear mineral glass with anti-reflective coating Aero-grade aluminum alloy construction HA III military grade hard-anodized Function selection via rotating head Waterproof in accordance with IPX-8 (two meters) This product has attained European CE and RoHS certification UPC: 6952506400591 Dimensions: Length: 2.87" (73mm) Diameter: .49" (12.5mm) Weight (Without battery): .29oz (11g)