4.5" overall. Clip. Impact resistant. Rechargeable. IPX8 waterproof submersible up to 2 meters under water. Luminus SST40 LED. Modes: Turbo (2030 lumens, 2.65h runtime); High (850 lumens, 2.9h runtime); Medium (260 lumens, 5.15h runtime); Low (40 lumens, 37h runtime); Firefly (0.5 lumen, 25 day runtime). Magnetic tail cap. One switch system. Low battery indicator. 330m beam distance. Requires (1) 18650 battery (included), or (2) CR123A batteries (not included). Aluminum construction. Color: Black. Boxed.