Glo-Toob Original Series Blue. 2 5/8" overall. Colored cylindrical housing. LED lighting source is viewable from 360°. High impact resistant design. Waterproof - up to 11,500ft. Twist on/off tailcap switch. Working temperature: 14°F to 176°F. Battery life: up to 30 hours. Uses one 23A battery (included). Includes split ring. Hang packaged. (CHINA)