4.25” overall. Clip. Impact resistant. Water resistant. Tailcap switch. 265 lumens. One hour runtime. Cree XPG2 LED. Gold-plated connectors. Polished aluminum reflector and optical glass lens. Three position twist selector allows choice of intermittent, constant-on, or locked. Requires (1) CR123A battery (included). Aluminum construction. Color: Black. Clam packed.