The PetSafe Stubborn Dog Stay & Play Wireless Fence Receiver Collar is designed for stubborn or hard-to-train dogs that require a higher level of intensity. It can be used to add another dog or as a replacement collar for the Stay & Play Wireless Fence or the PetSafe Wireless Pet Containment System. This rechargeable collar features 5 levels of static correction plus a tone-only mode for training. Trust PetSafe to help keep your pet healthy, safe and happy.