Includes 3 LR-44 Lithium batteries and tools. Tactical weaver style mount. Equipped with an on-off button. Tube Diameter: 31mm. Output Power: <5mW. Wavelength: 635-655nm. Max Reach Capacity: 500 yds. Adjustment Type: Allen wrench. One year limited warranty. Laser sight is made from tough lightweight aluminum BARSKA Laser Sighting Systems are powered by Lithium batteries which produces a bright dot for extreme sighting accuracy.