This highly professional instrument is both a compact monocular, with a zoom magnification of 2.1x-16.8x, and a truly versatile clip-on that will add the benefits of thermal vision to your sighting optics. There is no need to buy any extra accessories for this, as the #7956 already comes complete with various adapters to attach to any type of optics with a lens diameter from 44mm to 56mm. The thermal viewer is also waterproof and has other advanced features: 6 different palettes, Wi-Fi hotspot, photo and video recording function, distance calculation, etc.