Petsafe Extra Stubborn Dog Collar Receiver Higher intensity correction levels for stubborn or hard-to-train pets For dogs 8 pounds and up, 4 adjustable levels of static correction Tone with vibration option, Waterproof collar submersible up to 5 feet Uses 9-volt alkaline battery (not included) Compatible with PetSafe in-ground fences and Indoor Pet Barrier Transmitter (PIRF-100) NOT compatible with UltraSmart Rechargeable In-Ground Fence (PIG00-13619) and YardMax Rechargeable In-Ground Fence (PIG00-11115)