Dual Zone Heavy Duty Electronic Pet Fence 12 Acre Coverage 10 dog capability Free training e book Included. Train your pet in just two weeks! The In-Ground Dog Fence System will NOT hurt your pet. Static correction is mild and completely adjustable. Five progressive levels of correction allow you to administer training quickly but gently. It works wonders on stubborn or hard-to-train pets, while being safe for everyone who enters your yard. Static correction only enters the receiver collar through the two contact points. Receiver includes a tone plus static-correction-only mode for training. Our in-ground dog fence system covers up to 10 acres and most yard shapes or layouts. You can easily confine your animals to the back yard only; the front yard and backyard without access to the sides of your house; or full-property access One receiver collar is included for one pet. You can easily add multiple pets to the same system by purchasing an extra receiver for each animal The in-ground dog fence system works for pets of all sizes and either fenced or unfenced yards.