4" overall. Strobe. Weapon mountable. Water resistant. Impact resistant. Tailcap switch. Pack weight: 3.9 oz. CREE XPL LED. 1.26" head diameter. Features High (500 lumens, 1h 10m runtime), Low (50 lumens, 3h 55m runtime), and Momentary On. Memory retention. Includes a Pic Rail mount and remote on/off button with cord. Remote button includes hook and loop mounting straps and double stick tape. Crenulated head for self defense. Requires 1 CR123A battery (included). Aluminum construction. Color: Black. Clam packed.