State-of-the-art LED and microchip technology Four-function microlight: High power, Low power, Strobe and Emergency Mode Projects a pure, focused light beam up to 33 feet away, visible up to 1 mile away Water and crush-resistant polycarbonate body Internal stainless steel switch with momentary-on plus constant on/off Run-Time: 15 hrs per battery set Batteries: (2) lithium button-cell (included) Measurements: 3.25" x 1" x .25" Weight: 2.5 oz. Manufacturer's limited lifetime warranty