PetSafe Wireless Pet Containment System Receiver Collar Fits neck sizes 6-28 inches. 5 adjustable levels of static correction. Designed for dogs 8 pounds and up. Waterproof collar submersible up to 5 feet. Compatible with PetSafe Wireless Pet Containment System (PIF-300 system, IF-100 transmitter) and Stay+Play Wireless Fence (PIF00-12917).