PetSafe Wireless Pet Containment System PIF-300, 3-Dog System PetSafe Wireless Pet Containment System PIF-300, 3-Dog System. The package includes 1 wireless fence transmitter and 3 receiver collars. Designed for dogs 8 pounds and up. Fits neck sizes 6-28 inches. Features 5 adjustable levels of static correction. The correction automatically stops after 30 seconds. Tone-only mode alerts your pet with a beep. Covers an adjustable circular area up to 1/2 acre (180 feet in diameter). Receiver collars are waterproof.