It features the classic look of the original Solitaire flashlight introduced in 1988. And it works in the same simple way ? just twist the head to turn on, turn off and focus spot to flood. Length: 3 3/16 in. Barrel diameter: 1/2 in. Head diameter: 1/2 in. Weight with batteries: 0.8 oz. Includes 1 AAA alkaline battery.