Measures 2 1/2" overall. Black composition housing. Super bright LED with up to 12h of runtime and offers multiple modes (high, low, flashing). Night vision red LED. High- 100 lumens, 3h 45m runtime and beam distance of 71m; Low- 40 lumens, 12h runtime and beam distance of 49m. Features low battery warning. IPX4- water resistant. Uses three AAA batteries (included). Gray cloth adjustable headband. Hang packaged.