The Alpha Optics AO-4221 is modern, high-power, professional night vision hunting sight of Gen 2+ standing out for its compactness and light weight. It has all-metal housing made of light alloy (ergal), high-quality all-glass optics completely coated with anti-reflex layers, microprocessor controlled operating modes, low power consumption, ON/OFF, and low battery indicators, built-in infrared illuminator. It is available with 2 lenses of 3x or most used 4x magnification with internal focusing. It can also be equipped with continuous adjustment of power of the image intensifier tube and light exposure of the reticle. Standardly it is equipped with Weaver rail to attach additional powerful IR laser illuminator, collimator or other accessories. For viewing it can be mounted on a tripod.