This is the best Russian small open collimator "red dot" combat optic from Pilade manufacturer using laser-generated "heads-up display" (HUD) technology to superimpose a reticle pattern onto a filtered lens to provide precision CQB target acquisition. This system presents an unobstructed field of view, in 1x power which allows for extremely comfortable, "both eyes open" shooting. On average, most users will see a 50% gain in target acquisition times and a 50% smaller shot group at 100 meters versus iron sights. It is designed for engaging fast moving targets and targets appearing for a short period of time in close quarters and urban combat situations in various light conditions. It provides clear targeting from 104 lx to 10-2 lx (daylight, twilight and moonlight), one- or two-eye targeting, is very effective when shooting from moving vehicles, and allows for perfect kill shots on fast-moving, small and spontaneously appearing target. First and most important is a choice of three aiming marks - single dot, open T, open T with a dot. All these can be selected by the simple push of a button, as opposed to having a dial them in. "Two buttons" intuitively clear interface lets you easily adjust the brigtness, turn the scope on/off and select the mark. The sight provides 3.5 MOA dot and 15 with 16-pos brightness adjustment. At the rear and right are the adjuster screws. Marks in English make the adjusting procedure very simple. It is a tough, well built Red Dot with superior features at a fraction of the cost of other similar scopes. A definite Best Buy, it's lightweight, shockproof, waterproof, has a sealed body, and is for use in severe conditions. It comes with an adjusting limb, screw driver and manual.