PetSafe Surge Protector for Fence Transmitters Designed to protect your In-Ground Fence from surges or spikes that can reach it via your AC power connection and/or your buried boundary wire The Surge Protector must be plugged into a grounded (3-prong) outlet that is within 5 feet of the Fence Transmitter Do not install device if there is not at least 30 feet (10 meters) or more of wire between the electrical outlet and the electrical service panel (breaker box/fuse panel). Call, chat or email with our expert PetSafe US-based customer care specialists six days a week; They are waiting to assist you and your pet with your product needs PetSafe brand has been an industry leading US manufacturer of pet behavior, containment and lifestyle products since 1991, helping millions of people and pets each year