Ultra-clear, fully coated optics while maintaining excellent light transmission and brightness,Help you understand any goal, whether you are looking for birds or want to better understand the stage. clearer, and brighter. The larger the objective lens, the enters a single eye and the brighter the image. A built-in lens dust cover prevents lens dust and ensures you see all the clear details. BAK4, has no clear images of black bars, it makes ultra-clear images. Waterproof, the mirror is filled with high purity nitrogen, waterproof and anti-fog. You can use it in rainy and humid environments without worrying about this project. Magnification: 40 times Waterproof type: waterproof Specification: 40x60 Field of view: 1500m/9500m Coating: green film Focusing mode: hand wheel focusing eyepiece focusing Prism system: roof colour:black Material:Rubber+optical glass+engineering plastic size:Product size: 155mmx70mmx52mm Eye lens diameter: 16mm Outer diameter: 60mm Monocular size: 144 x 80mm Objective lens diameter / eyepiece diameter: 40mm / 18mm Package Contents: 1* telescope 1* desiccant 1* wipe cloth 1* soft pack 1* lanyard 1* instruction manual note: It is a low-light night vision telescope, which means it can be used for night vision Some light but not for full night vision. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.