These are indoor shock collars to keep dogs out of things. I also included a shock color to keep dogs inside of areas. Our dogs have been struggling to stay out of the cat food so these are set up to keep them out however we have a puppy and he continues to chew on the stupid collar. This is our third set of colors the colors that came with the shock option are awful, and these are much better as he gets older. He doesn’t chew them up as much thankfully and we also can get a two pack for less than $10. LTKdayinmylife