Perimeter Technologies Comfort Contact Extra Receiver CollarThis collar is compatible ONLY with Perimeter Technologies brand Pet Fence Systems and is NOT compatible with ANY Other brand! Purchase an additional Perimeter brand dog fence collar receiver to add to any Perimeter brand dog fence kit. This collar can be used as a replacement for a lost receiver or to add an additional dog to your system. Perimeter brand dog fence kits will support any number of dogs. Features: 5 Independently Adjustable Correction