Micro green dot optic with on/off switch. Specifications: - green dot Micro dot reflex optic - dot size: 2 MOA - LED (light Emitting Diode) 100% safe for the eyes - Unlimited eye relief for flexible mounting - 23.5x16. 8mm objective lens - on/off switch - integrated Weaver/Picatinny rail style mount - powered by 3 volt lithium batteries (CR2032) included - includes extra battery, lens covers, and mounting/adjustment tools - black anodized aluminum body