5 7/8” overall. Universal focusing LED optic. Twist focus. Rechargeable High: 245 lumen output, 1h 30m runtime, 93m beam distance. Rechargeable Low: 26 lumen output, 6h runtime, 31m beam distance. Alkaline High: 86 lumen output, 2h runtime, 55m beam distance. Alkaline Low: 10 lumen output, 26h runtime, 19m beam distance. Flex charge dual power. Lithium Polymer battery (1 included) or 2-AAA alkaline batteries (included). Impact resistant, lightweight aluminum housing. Color: Black.Lithium Ion contained inside item.