42mm objective lens and a 220mm length frame. Adjustment magnification can zoom up to 3X-9X. MIL-DOT red & green illuminated reticle through scope. Durable metal frame to prevent damage. Scope uses one CR2032 battery (Included) for a great value. Windage and elevation is capable of being adjusted. Capable to mount most 20mm Picatinny/Weaver rails. Improved lines now with integrated glass etched reticle. In the Box 1X Scope 1X Battery Specifications: California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov