Specifically engineered for CQB engagements, the Holosun® HE515CM-GR Green Dot Sight features a precision-machined and hard-coat anodized 7075 T6 aluminum housing for superior strength and unmatched performance under stress. The Multi-Reticle System allows you to choose your favored reticle (2 MOA dot, or 65 MOA circle) for enhanced reliability, while 12 brightness settings (10 daylight; 2 night vision) deliver exceptional clarity in any lighting. Multilayer reflective glass lenses deflect stray light away from your eye for exceptional clarity and reduced eye fatigue, and Solar Failsafe™ technology harnesses the sun’s energy to power the unit in daylight environments, conserving battery life for overcast or low-light conditions. Operating on a single CR2032 battery (included), the HE515CM-GR offers an impressive 50,000-hour battery life on the lowest setting. Better yet, Shake Awake™ technology automatically activates the red dot when it detects motion for instantaneous, hands-free activation, and automatically powers down the unit when the weapon is idle.