The Osprey Global 3-9x42 Compact IRF Riflescope is a shock, fog, and waterproof scope with an illuminated range finding glass reticle (IRF) and an eye relief of 3-10". It's Picatinny compatible with a length of 8.9" and a 30mm tube diameter. It's powered by a single CR2032 battery. Mounting rings, see through flip-up dust covers, and mounting tools are included with the scope.