The versatile Railway sight easily attaches to any Picatinny-style rail. Its heads up display provides an unobstructed view of the target and allows for shooting with both eyes open for improved peripheral vision and depth perception, 29mm lens. Runs on a 3 volt lithium battery for up to 1500 hours of continuous use.C-MORE Systems red dot sights provide infinite adjustment capability. By eliminating "clicks", the adjustments can be set to exact positions, resulting in pin-point accuracy. Dual Positive Locking System screws for both windage and elevation lock the adjustment screws in position. The adjustments also feature a wide range of adjustment. Up to 800 inches of adjustment @ 100 yards are available for both windage and elevation. This eliminates the need to compensate for sight misalignment during the mounting process.