The PetSafe Deluxe Indoor Pet Barrier Containment System is a compact and easy-to-use system that is perfect for keeping your pets safe and secure. With a range of 2-10 feet, this system is perfect for any household. The tone-only mode provides a non-stimulation warning, while the unlimited additional receivers allow you to add as many extra receivers as needed. This system is made for indoor use only, so your pets must be trained to be able to use it.