With a simple CR2032 battery, you can power the American Tactical Imports Tactical Electro-Dot Sight and unleash an array of useful features that will vastly enhance your accuracy and overall shooting experience. American Tactical Imports crafted these Red Dot Sights from aircraft grade aluminum for optimal durability and shockproof construction that doesn't weigh down your firearm. For enhanced customization, the ATI Electro Red/Green Dot Sight offers 4 different reticle patterns: dot, cross, star burst, and bullseye.