4" overall. Black aluminum housing with anti-roll head and black finish stainless pocket clip. High output C4 LED. High up to 70 lumen output with 30 minutes runtime, visible to 47M; low up to 5 lumen output with 11 hour runtime, visible up to 11M; and strobe with 1.2 hour runtime. Three user selectable programs. Ten-tap programmable switch. Waterproof to 1M for thirty minutes. Impact resistant to 1M. Uses one AAA battery (included). Black nylon belt sheath. Hang packaged.