With a comfortable fit for your dog, the PetSafe Stay+Play Stubborn Receiver Collar is perfect for hard-to-train pets. This rechargeable collar features five levels of static correction at a higher intensity for stubborn pets and a tone-only mode for training. Ergonomically designed collar is slimmer and lighter for a more comfortable fit. 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. For dogs 5 lbs. and up. Fits neck sizes from 6-28. Stubborn Dog model boosts intensity for hard-to-train pets. Available: Standard, Stubborn Dog. Cancer and Reproductive Harm- www.P65Warnings.ca.gov.