Working voltage is wide and can utilize the batteries in the largest extent. Suitable for hunting, cycling, climbing, camping and outdoor activity etc. Specifications: Colour: Black Lumens: 300LM Reflector: Convex Lens Material: Aluminum alloy Model of LED: CREE Q5 LED Switch: Tail-cap press ON/OFF Battery: 1 * AA / 1 * 14500 3.6v Battery (no included) Size: 9.4*2.6*2.6cm Weight: 65g