SPJ: Dual Focus Waterproof Telescope 16x52 Optics Zoom Monocular Scalable Telescopic Multi-coated optics upgraded version of the green AR. Twist-up eyecup. Single hand operation. This monocular offers an 16x magnification and a 52mm objective diameter, perfect for Fishing, Birdwatching, Concerts, etc. Rubber Armored for rugged field use center focusing mechanism for quick,easy focusing. Suitable for enjoy beautiful nature, view birds, watch sorts, general purpose. Powerful, ultra-compact and ultra-lightweight. Good for anyone's first scope gift.