describe: Great and Effective Electric Dog Fence System: Dog safety is always our concern, let your dog roam freely in your backyard without invading neighbor's house or road, you never have to worry about anything when you are out Things; Equipped with a receiver and transmitter to help train your dog to develop the habit of living in its own independent space, keep your furniture and daily necessities clean and tidy, especially to keep your pet away from the uneasiness of living in a real fence KEEP DOGS AWAY FROM CHICKEN: The underground dog fence system collar works automatically when the system is installed; the electric dog fence collar beeps and shocks when your dog tries to cross the boundary line ADJUSTABLE CONTROL RANGE: The electric dog fence allows you to control the width of the boundary by adjusting the knob; customizable range up to 1.2 acres/53189 square feet. Disconnection alarm, if disconnection, can tell you in time; red low battery indicator light prompts you to replace the collar battery, otherwise it will cause work interruption SUPPORTS MULTIPLE DOGS: Fits a variety of dogs weighing 4and pounds and neck sizes from 7.5 inches to 17.92 inches. One transmitter can be paired with 3 collar receivers Note: Our package only contains dual receiver collar; Comes with 984FT Buried Wire; Electric Fence Dog Training Sign Banner No more fence jumping! : This weekend do-it-yourself project allows you to create an underground fence that fits your yard; a safe and efficient dog containment system; Recommendations: Use only under the supervision of the dog owner; do not leave the collar receiver on the pet for more than 12 hours per day Package contents: 1 piece hair collar