Functions  1.Waterproof, dust-proof, all-weather binoculars suitable for outdoor use even under severe conditions such as watersports and mountaineering. 2.Fold down eyecups, Attached lens covers, Rubber armor covered, whether you are ashore or on the water, this binocular is designed to perform in the most demanding conditions. 3.Internal rangefinder scale and directional compass with illumination switch indicate the distance or size of the object being viewed and its orientation. 4.Hi-index BAK4 prism features a bright, Fully multi-coated optics,sharp image with vivid contrast to offer you every little detail of an object;Rubber-coated body provides great shock resistance and a comfortable touch, firm grasp.  Specification  Magnification:10X Objective lens diameter: 50mm Prism Type: Porro Prism Binoculars Prism Glass: BAK4 Exit Pupil: 7.1mm Field of view: 396FT/1000YDS Resolution: 5.6 degree Weight:890g Eye Relief: 23mm Brightness:49.0 Focusing:Binocular Focusing Type:Binoculars Size:150mm*220mm*60mm Lens coating: Fully multi-coated Features: Coording compass,Rangefinder,FMC broadand coating,Waterproo f& anti-fog Adapter battery:2*LR936