Dogtra Pathfinder Electric collar for dogs Works just like an electric fence but not nearly as expensive Use your phone to walk the perimeter of the property you don’t want your dog to leave. The collar will alert you and give your dog a warning if he/she crosses the border. You can also track where your dog is on the app. It’s pretty sweet. Our dog is trainee now which is why we don’t need it. Orange and black All in excellent condition. Just two marks on the collar for us to know what size we needed to keep it all. Completely functional. No issues! Smoke free home.