PetSafe in-Ground Fence Receiver Collars for Cats and Dogs, Waterproof, Tone and Static Correction ADD UNLIMITED PETS TO YOUR SYSTEM - keep as many pets as you need safely in your yard with this add-a-dog receiver collar. Compatible with PetSafe in-ground fences except UltraSmart Rechargeable In-Ground Fence (PIG00-13619) and YardMax Rechargeable In-Ground Fence (PIG00-11115). Also compatible with the Indoor Pet Barrier Transmitter (PIRF-100) to protect your pet indoors 4 LEVELS OF CORRECTION - plus tone-only mode for training. Pets can be trained in 2 weeks when used as directed WATERPROOF RECEIVER COLLAR - with low battery indicator ADJUSTABLE RECEIVER COLLAR - fits pets 8 pounds or more with neck sizes 6 to 26 inches SHORT AND LONG CONTACT POINTS INCLUDED - for pets with long or short hair BATTERY INCLUDED - features easy to install RFA-67 battery Call, chat or email with our expert PetSafe US-based customer care specialists six days a week; They are waiting to assist you and your pet with your product needs at 1-800-732-2677 or by email at ccc3@petsafe.net Manufacturers warranty is only valid when purchased from an authorized retailer