*From the Bushnell site * 'The Bushnell Tac Optics Big D(ot) features a MASSIVE 37mm objective, which delivers bright images and an unrivaled field of view in the red dot market. Waterproof Construction - O-ring sealed optics stay dry inside, even when totally immersed in water. Shockproof construction - Built to withstand bumps, bangs, drops and the rough-and-tumble environment of the field. Nitrogen Purged Fog-Proofing - Nitrogen inside the scope ensures interior optical surfaces won?t fog due to humidity or rapid temperature change.' Like new condition. Pick up near Worlds of Fun.