PetSafe Indoor Radio Fence for Cats and Dogs, Transmitter Only, Adjustable Range Up to 10 ft Radius, Tone and Static Correction KEEP PETS AWAY from off limits areas inside the house such as a kitchen, nursery or furniture. Place the barrier near the area you want to protect TONE AND STATIC when your pet strays into unwanted area the receiver collar will tone followed by a stimulation to remind him to leave the off limits area TRANSMITTER ONLY which is compatible with any PetSafe In-Ground Fence receiver collar excluding the YardMax, UltraSmart and PawzAway collars. A receiver collar is required (sold separately) for system to operate ADJUSTABLE RANGE electronic barrier protects areas up to 10 ft. radius. Must plug into a power source EXPANDABLE increase your systems range with additional Indoor Radio Fence transmitters Operating range may be affected by a variety of factors including metal objects 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 PetSafe brand has been an industry leading US manufacturer of pet behavior, containment and lifestyle products since 1991, helping millions of people and pets each year