How to Adjust the Field Width on an Invisible Fence
Invisible underground fences help keep your pets in the yard without having to install unsightly and expensive aboveground fences. Your pet's collar acts as a radio receiver, and the buried fence acts as a transmitter. If your pet gets too close to the line, the collar receives a signal from the transmitter and delivers a mild corrective shock. With a simple turn of a knob, you can adjust the strength of the radio signal, altering the width of the correction zone.