5 7/8" overall. Black hard anodized aerospace grade 6061-T6 aluminum housing with advanced reflector and stainless wire pocket clip. White CREE LED. Four modes: high - 180 lumens, medium - 70 lumens, low - 25 lumens and strobe. Runtime: high - up to 26 minutes, medium - up to 160 minutes and low - up to 38 hours. Beam distance: up to 56.5m. Push button on/off tailcap switch. Water resistant. Impact resistance: up to 1m. Uses two AAA batteries (included). Hang packaged.