The Surge Protector for Pet Fences protects your In-Ground Fence™ transmitter from potential power surges or spikes caused by lightning strikes. Plug the surge protector directly into your power outlet to connect it to your new or existing In-Ground Fence™ system. Your pet deserves the best. Trust PetSafe® to keep your pet healthy, safe and happy. Features Helps protect your In-Ground Fence™ system from potential power surges Compatible with all PetSafe® in-ground pet fences: Stubborn Dog In-Ground Fence™ Rechargeable In-Ground Fence System™ In-Ground Cat Fence™ Deluxe Little Dog In-Ground Fence™ Basic In-Ground Fence™ YardMax® Rechargeable In-Ground Fence™ In-Ground Fence™ Classic In-Ground Fence™ More Info Visit our support site to learn how to setup the surge protector with your In-Ground Fence™.