The Holosun® AEMS Red Dot Sight is a compact and lightweight red dot sight, compatible with most rail-equipped rifles and shotguns. The precision-machined and hard-coat anodized 7075 T6 aluminum housing easily withstands punishing recoil. Solar Failsafe™ technology harnesses the sun’s energy to power the unit in daylight environments, conserving battery life for overcast or low-light conditions. Shake Awake™ technology automatically activates the red dot when it detects motion for an instant, hands-free activation, and automatically powers down the unit when the weapon is idle for an extended period of time. The Multi-Reticle System allows you to choose your favored reticle (2 MOA dot, or 65 MOA circle) for enhanced reliability, while multiple user-selectable brightness settings deliver exceptional clarity in any lighting. Better yet, this red dot operates on a single CR2032 battery (included) and delivers an impressive 50,000-hour battery life (lowest setting). Plus, multilayer reflective glass lenses deflect stray light away from your eye for exceptional clarity and reduced eye fatigue.