Seals Rifle Scope 3-9x40 lens coating : broad band fully multi coated lens, emerald green anti-reflection, discoloration, and enhance contrast hard anodized, anti-scratch black textured finish to reduce reflection water proof, shock proof, and nitrogen gas filled elevation and windage knob 1/4 moa illuminated blue and red, CR2032 battery installed on the scope tube: one piece, aluminum alloy 6061T6, 25.4mm tube diameter