The system works by producing a radio signal from the fence transmitter through up to 2800 feet of boundary wire. The wire is buried or attached to a fixed object to enclose the pet area. Temporarily define this pet area with boundary flags for a visual aid in training your pet.Your pet wears a receiver collar with contact points and once trained is allowed to roam freely in the pet area. When your pet reaches the warning zone, the collar gives a warning beep. If your pet continues into the static correction zone, a safe static correction will be delivered through the contact points to get their attention until they return to the pet area. This fence features: a comfort fit collar that has a quick fit buckle that provides a quick release and perfect fit, adjustable, waterproof receiver and a flexible collar. The fence covers up to 10 acres (additional boundary wire purchase is necessary). This kit includes 500 feet of wire and 50 flags. Manufacturer lifetime limited warranty. Non-returnable 3 days after receipt.