Keep your dog safely enclosed around the house without expensive fencing or cumbersome leads with the SportDOG Brand SDF-100C In-Ground Fence System. With a smaller collar unit than the original In-Ground Fence and more options, the SDF-100C system comes with 1,000 of wire to help you create a safe area up to 1-1/3 acres for your dog to roam in. Powered by radio signals from a buried wire to the collar receiver unit on your dogs neck, the receiver unit uses vibration and tone warnings, along with 7 levels of static stimulation, to encourage your dog to remain in the area you have set off. In addition to the collar unit and boundary wire, this system comes with a fence transmitter, 100 flags to mark the boundary, and a charging adapter for the collars lithium-ion battery. Designed for dogs weighing 10 lbs. and larger. Expandable system accepts additional collars (not included) and additional wire kits (not included) to expand the safe area (up to 100 acres). Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Containment Fences.