HappyPet&reg; In-Ground Electric Dog Fence System (Deluxe Pro) Easy to setup and maintain Allows you to set an invisible perimeter around the yard that your dog will learn about and respect Waterproof and weatherproof dog control collar so you never have to worry about it getting wet Add as many collars as you like to the system. You can use it to contain 1 dog or 10! Designed to make it easy for both the dog and dog owner to both make and accept the "hidden fence" around your property