5 1/2" overall. Black aluminium body with textured rubber grip. Anti-roll head. O-ring sealed. Waterproof to 1m. Push button tactical tail switch. C4 LED with high, low, and strobe modes. High mode - up to 600 lumen output, visible to 253m with 1 hour, 15 minute runtime. Low mode - up to 33 lumen output, visible to 57m with 18 hour runtime. Uses two CR123A batteries (included).