<p>The Instant Fence Transmitter is for the PetSafe;Wireless Dog Fence. This transmitter is compatible only with the Instant Fence Receiver. The part number for this dog fence transmitter (found on the back) is IF-100.</p> <h3>Increase Your Wireless Dog Fence Coverage with Additional Transmitters</h3> <p>The range of The PetSafe Wireless Dog Fence can be increased by using two or more transmitters.; This creates intersecting circles and the signal is cancelled where the circles intersect. This;allows your pet access to the entire area. One additional transmitter would create a boundary that is up to 180 feet wide and up to 330 feet long.</p> <p>One additional transmitter would create a boundary that is up to 180 feet wide and up to 330 feet long. Includes Transmitter and AC Power Supply.</p>