PetSafe Pawz Away Extra Receiver Collar for Pawz Away Pet Barriers for Cats and Dogs over 5 lb., Static Correction, Pet Proofing Collar ADD UNLIMITED PETS TO YOUR SYSTEM - as long as each pet is wearing a collar compatible with your Pawz Away Barrier, they will stay away from designated areas. Not for use as a containment system; correction designed for avoidance Compatible with:Pawz Away Indoor Pet Barrier (ZND-1200, ZND-1000),Pawz Away Outdoor Pet Barrier (PWF00-11923, RFA-378),Pawz Away Mini Pet Barrier (PWF00-13665, PWF00-14040),Pawz Away Threshold Pet Barrier (PWF00-14406, RFA-514).REQUIRES PAWZ AWAY BARRIER TO OPERATE - compatible with Pawz Away Outdoor Pet Barriers, Pawz Away Indoor Pet Barriers, Pawz Away Mini Pet Barriers and Pawz Away Threshold Pet Barriers WATERPROOF, ADJUSTABLE COLLAR - lightweight collar fits pets 5 lb. and over with neck sizes 6-28 inches PROGRESSIVE STATIC CORRECTION - starts at the lowest level and increases after 3 seconds AUTOMATIC SAFETY SHUT-OFF - correction stops after 15 seconds BATTERIES INCLUDED - receiver collar uses 2 (3 Volt) lithium batteries 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