Forcefield Outdoor Pet Fence with Dog CollarForcefields Outdoor Pet Fence gives your pet the freedom to roam within the boundary that you have chosen, providing a happy and safe environment, without the need for restrictive ropes, chains, walls or bars. A small transmitter sends a continuous signal through the underground wire, which marks the boundary of the property. This system offers many advanced features not found on other pet containment systems. The system uses special programming