These binoculars from K&F are a good introduction to the world of stationary optics in the mid-price segment. The finish: they are made of high-quality rubber and plastic materials. With an IPX6 rating. This device is dust and waterproof up to a certain limit. All buttons are smooth and feel balanced. The eye diopters (back of the lenses) are also well designed and have a good range for people with uneven eye sockets. The focus rings are also well balanced and smooth to operate, which significantly increases blur when focusing on a specific object. From far away up to 10 meters away. It almost feels like setting a video camera to depth of field. The glass: BAK4 prisms FMC multi-layer coated eyepiece and objective lens with 99% light transmission. This means that the lens captures more light and can be used properly even in low light. The 10x42 means 10x magnification and 42 cm of glass on the other side (at the end of the device). More cm means more potential for light gathering in weaker light and a brighter and more accurate image. I use it on a tripod to keep an eye on my garden during the day. They also work great at night. Just use a long throw flashlight and you can see the glowing eyes from a safe distance. Perfect for close range hunting and even for archery or pellet shooting. Simply point them at your target and you can see your groupings without having to leave your seating position.