The rugged Celestron 8x42mm Cavalry Monocular 71215 is designed for hunters, boaters, law enforcement, and military personnel. Engineered to withstand the elements, this Monocular from Celestron is fully waterproof and nitrogen purged to prevent internal fogging. The housing is protected by durable rubber armor, making the monocular easy to grip while protecting it from hard use. The olive drab color offers concealment in the field. As an optical instrument, the Celestron Cavalry 42mm Monocular offers professional features including a high-grade BaK-4 prism and fully multi-coated optics for superb light transmission. The Celestron Cavalry Monocular Series, has an integrated compass and reticle. The compass will help you determine the direction of objects in relation to you and the reticle allows you to determine their size and distance away. The Celestron Cavalry 8x Outdoor Monocular is a useful tool for anyone out in the field or on the water.