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.