1. Single Hand Focus, & Fog Proof: Ergonomic design helps you focus on your target quickly and accurately with one hand. And the long-lasting rubber armor with stripes makes it comfortable for use, non-slip grip, and long-lasting external protection from your hand. 2. Amazing Crystal Clear View: For Dual focus design, high light transmission, the focus can provide a brighter and higher-contrast images to you. The eyecup can be twisted up to deeply focus the view for yourself, and then adjust the focus adjustment and zoom adjustment until the view become clear. 3. 40x60 Monocular Telescope: The high power Monocular provides 40x magnification with 60mm objective diameter wide lens, 360ft/1000yards of large field of view, BAK4 prism lens design,Focular telescope has large field of view ,High refractive index MC multi-layer enhanced green film increases light transmission for brighter and higher-contrast images,even in the case of low light is also clear and bright. 4. for all kinds of weather: Built-in lens dust cover prevents the lens from dust/moisture/debris, make sure you see everything in a clear detail.The surface rubber texture is non-slip, making it for one-handed and prevents it from falling.IPX7 Nitrogen-Filled with a fog-resistant coating and O-ring sealed optics prevent moisture, dust and debris to keep it clear all the time.Even if you are in the worst weather, you can still use it .