Thermion 2 LRF thermal imaging riflescopes are designed for use both at night-time and during the day. They provide exceptional image quality even in adverse weather conditions such as fog” smog and rain without being hindered by obstacles like branches” tall grass” dense foliage” or other debris. Unlike riflescopes based on electrical to optical converters” thermal imaging riflescopes do not require an external light source and are resistant to high levels of illumination. These riflescopes come with a built-in high precision rangefinder with a maximum range of 800 meters (875 yards). These riflescopes are designed for hunting” target shooting and other forms of recreational shooting.