Sightmark Volta Solar Red Dot Sight. Sightmark's Volta Solar Red Dot Sight features a dual power system to keep your red dot powered anytime and anywhere. The Eclipse Light Management System auto dims and brightens the 2 MOA red dot reticle based on your environment. The sight features a parallax free lens system with a 28mm objective lens with anti reflective lens coating, and unlimited eye relief. Its rugged design is constructed of 6061-T6 aluminum and is IP67 waterproof. Sightmark Volta Solar Red Dot Sight Features. Innovative Eclipse Light Management System automatically dims and brightens the red dot reticle based on your environment. Solar panel for infinite daylight use. Adjustable mount height- Low Picatinny mount and absolute cowitness mount included. Dual power system- combined state of the art solar cell technology with proven battery power to keep your red dot powered at anytime, anywhere. Parallax free lens system 28mm objective lens with anti reflective lens coating. 2 MOA Red Dot Reticle.