A transmitter, usually placed in your basement or garage, sends a radio signal along the wire. The radio signal is picked up by your pet’s Computer Collar, which emits a warning sound when your pet approaches the Invisible Boundary.
How do I train my dog for an Invisible Fence?
Quote from video: Approach the warning zone. When you hear the alert guide the dog back into the yard and reward them with a treat. Next introduce correction set the transmitter to apply a low level of correction.