3.63" overall. Water resistant. Impact resistant. SOS strobe. Tailcap switch. Clip. Lanyard. Rechargeable. Light bulb is CREE XP-L. Nichia 219C can also be used. Modes: High-18650 (950 lumens, 35m runtime); High-CR123A (420 lumens, 1.5h runtime); Low (1 lumen, 80h runtime). 220m beam distance. Step-less dimming. Rotary control ring. Comes with 2 O-rings and rubber cap. Requires (1) 18650 battery (included), or (1) CR123A battery (not included). Aluminum construction. Color: Black. Boxed with hanging tab.