An easy to use wireless indoor model that emits a signal directly from the transmitter without the use of a boundary wire. Place the unit in the area you want your pet to avoid (transmitter should not be on or near metal objects).
You can adjust the signal range (the distance that the radio signal radiates from the transmitter) by using a small screwdriver. Turn the knob toward the "+" to increase the range and toward the "-" to decrease the range. The signal range can be adjusted up to 10 feet in diameter (5 feet in all directions from the transmitter).