This is a BSA Optics 30mm Red Dot Illuminated Optic Sight Black. The BSA is a lightweight sight for close quarter and medium range targets. Light enough for small calibers plinking on the range, yet durable enough for larger calibers used by hunters and law enforcement departments. Features a Weaver style attachment, 11 position rheostat, 5 MOA, and one year limited warranty from the manufacturer. Operates on a standard 3 volt lithium battery #CR2032 (included).