Add multiple Extra Indoor Pet Barriers to your PetSafe Pet-Barrier system to block out pets from certain areas of your home. Just place the barrier near anything you want your pet to avoid and slip a Pawz Away compatible collar (sold separately) on your pet. Adjustable barrier range protects areas from 2-12 ft. in diameter. Battery-operated barrier (three alkaline batteries reqiuired) fits easily in small spaces. System designed for dogs and cats weighing 5 lbs. and up. Add an unlimited number of pets with purchase of additional collars. System includes barrier transmitter and operating and training guide. For indoor use only.