You will get a unit about the size of a paint can that throws out an invisible signal in a radius around you house. When your dog goes outside of this radius, they get shocked. You can adjust the radius to suite your needs. You just plug the unit in, set the radius, put the collar on your dog, and you're good to go. It's portable as well so if you like to go camping, take the unit with you and you can set it up at you campsite or wherever you are going. I LOVE this thing!!
answered 3 years ago
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