Covers up to 10 acres. Provides freedom and safety for your pet. Quick and easy to install, reliable and safe. Transmitter plugs into a standard outlet and emits a radio signal that travels along an underground wire. A lightweight receiver is worn on the pets collar, which picks up the signal and alerts the pet as he nears the underground boundary. Once your pet is trained, he will learn to stay in the boundaries of the fence system. Includes transmitter with power adapter, deluxe ultralight receiver with adjustable collar, operating and training guide, battery, 500' wire and 50 flags, capsules and wire connectors, and test light tool. 1 year manufacturer warranty. Additional collars for this unit: Model No. PUL-275 (SKU 842265).