4 1/2" overall. CREE XM-L2 LED. Maximum output of up to 960 lumens. Peak beam intensity of 25,000cd and a throw distance of up to 315 meters. Eight rapidly switchable brightness modes. High efficiency circuit board provides up to 400 hours runtime. Uses four AA batteries (not included). Includes holster, lanyard, and spare O-ring. Instant ultra-low or turbo to bring flexibility and convenience. Reverse polarity protection prevents damage due to incorrectly inserted batteries. Toughened ultra-clear mineral glass with anti-reflective coating. Constructed from aero grade aluminum alloy. Sturdy HAIII military grade hard-anodized. Waterproof in accordance with IPX-8 (two meters submersible) Impact resistant to 1.5 meters. Tail stand capability. Boxed with hanging tab.