DOGS WERE QUICK TO LEARN TO STAY IN DESIGNATED AREA: Pet safety is always our concern, for your dog to roam freely in your backyard without intruding into the neighbor's house or the road,you will never have to worry about anything when you go outside;Come with receiver and transmitter, help to train dogs to shape the habit of living in their own independent space and keep your furniture and daily necessities clean and tidy,especially keep your pets away from the uneasy of living in a real fence THIS PRODUCT WORKS GREAT!: After a couple zaps he quickly learned to stay away from the fence,the collar works automatically once you install the system; It will send beep and shock as your dog try to cross the boundary wire; The more intense the shock will be, effectively train him back to the play area you set KEEP THE DOG AWAY FROM THE CHICKENS: The electric underground dog fence system allows you to control the width of the boundary by adjusting the knob; Customizable range up to 1.2 acres/53189Square FT; The wire break warning can tell you in time if the wire is broken; The red indicator prompt you to replace the collar or it cause intermittent operation