8 3/8" overall. Three modes and strobe: High (640 lumens, 1.25h runtime), Medium (340 lumens, 2h runtime), Low (170 lumens, 4h runtime), and strobe with runtime of 3 hours. Multi-function on/off push button switch lets you choose between lighting modes. Deep-dish parabolic reflector produces a concentrated beam with optimum peripheral illumination. C4 LED technology, impervious to shock with a 50,000 hour lifetime. 3-cell, 3.6V Ni-MH sub-C battery, rechargeable up to 1000 times. 10 hour steady charge, 2.5 hour fast charge, and PiggyBack charger options. Black machined aircraft aluminum body with non-slip rubberized comfort grip and anti-roll rubber ring. IPX4 water resistant and 1m impact resistant coating. Serialized for positive identification.