The Volta solar red dot is truly the best of both worlds" combining solar and battery power to provide uninterrupted operation. The Volta is powered by 2x AAA batteries and features solar cells directly on top of the optic" giving users the option to choose what works best for their situation. Volta red dots boast the Eclipse Light Management System" a revolutionary technology for red dots which automatically adjusts the red dot reticle's brightness based on the shooter's environment. The heavy-duty Volta's covered design is tougher than open-style red dots and a scratch-resistant" anti-reflective lens coating adds even more durability. Other popular features include an adjustable-height mount" digital switch brightness controls" single side access to both windage and elevation adjustments" unlimited eye relief and shockproof design. All Volta red dots come standard with a protective rubber cover" low picatinny mount" absolute cowitness mount and Sightmark's Lifetime Warranty.