Introducing Streamlight's first virtually indestructible, super-bright, nylon polymer tactical light. This tool will help you illuminate any situation for up to three hours at a time. With a tailcap push button, you can switch on 130 Lumens in seconds. To ensure you get the most light during the tactical flashlight's lifespan, the Streamlight PolyTac LED Tactical features Solid State Power Regulation. Runtime: Up to 3 hours Dimensions: Length: 5.22 in. (13.3 cm); Major Diameter: 1.25 in. (3.18 cm); Body Diameter: 1.00 in. (2.54 cm)