Rechargeable power makes ATN devices practical for long outings. Instead of stocking disposable cells, users charge up through a standard cable and head out with confidence. Battery life varies by model, but most scopes, monoculars and binoculars last through a full evening of use. Combine that with solid housings, weather resistance and a mobile app, and you have optics ready for real work. ATN Corp, founded in 1995 in California, develops thermal and digital night vision gear for hunters and outdoor users.