A Great addition to your Underground Containment System is the PetSafe Indoor Radio Fence Transmitter. System allows you to keep pets off furniture, away from plants, the nursury or out of special areas in your home. Transmitter range is adjustable from about 2 to 20 feet. Quick and easy to install. Just place the transmitter in the are you wish to keep pesky pets away from and set the radius you desire. Your pets will stat away from those areas. Works with the deluxe ultralight receiver.