The HS515CM is a ruggedized micro red dot sight with the option of a 2MOA dot only or a 2 MOA dot with a 65MOA circle reticle pattern. Employing LED technology, the life time for one CR2032 battery can reach 2 years if left on constantly. However, the solar technology and automatic brightness adjustment work together to extend the battery life dramatically beyond that for the average shooter. This sight has extra rugged features including a CNC milled 7075 Aluminum housing, pressure tested for submersion up to 30 meters for 30 minutes and a snag free housing design that protects the windage and elevation turrets. Includes:clear flip-up lens coverskill flash filterquick release weaver-style mountFeaturesSolar Fail Safe TechnologyShake Awake Motion on with last setting recallAutomatic reticle intensity adjustment in solar modeParallax free, unlimited eye reliefWaterproofSwitch between a 2 MOA dot & 65 MOA Circle with dot. No re-zeroing required10 daylight and 2 night-vision compatible...