When ambient light is low, foliage is thick, or fog lies heavy on the land, you can still use thermal imaging devices because they register heat signatures instead of visible light. Sig Sauer Echo1 thermal reflex sights can locate predators or hogs day or night, even when they are hunkered down in a clever hiding spot. Using the newest generation of thermal imaging sensors in Echo1 sights, you can quickly acquire an image with both eyes open. Choose the color palette that works best in your environment. These Sig Sauer sights are also great for home defense, law enforcement, military, and search and rescue situations. Echo1 sights are covered by the Sig Sauer Infinite Guarantee and Electronics Limited Warranty, so your satisfaction is guaranteed. Browse our article about thermal imaging to help decide on your purchase. Or contact us and one of our product experts will help you choose a unit you'll be proud to own and use. When you shop at OpticsPlanet.com, you get great service and great gear at great prices.