Top Grade 1 Watt Luxeon LED ? Output up to 25 Lumens. Extremely Bright! ? 10 Times brighter than standard LED ? Approx. 130mm Long. 35mm diameter ? Use 2 X CR123A Batteries last for about 5 hours continuously. Batteries included! ? Precision Machined Aircraft Grade Crush Resistant Aluminum ? Ideal for Law enforcement, Security, Construction field. Work under very hash condition ? Nylon Holster Included ? DO NOT LOOK THE LED DIRECTLY WHEN IT IS ON. IT IS HARMFUL TO YOUR EYE.