So cool you might get frostbite. Brunton's Echo Zoom Monocular has a 10-30 power zoom with a 21 mm aperture. Compact and tripod adaptable, this pocket scope brings nature to you. Compact in size but powerful in performance with a 10-30 power zoom and adjustable focus, this pocket scope really brings objects in close. BaK-4 prism glass gives you clear, precise optics for a wide range of applications. Multi coated lenses for crisp, clear viewing. Tripod compatibility lets you vastly stabilize your image making those far off objects much more clear. Neck lanyard and case included.