In-Ground Radio Fence by PetSafe

PetSafe says:

This in-ground fencing system is one of the most affordable ways to keep your dog safe and secure in his own backyard. He’ll hear a warning tone as he nears the boundary you’ve established and a quick correction if he attempts to cross it. The lightweight, adjustable collar is the perfect complement to the newfound freedom your dog will experience on his old turf.

Product Features

    * Waterproof receiver collar
    * UltraLight™ receiver with adjustable collar
    * Includes 500 ft of wire and 50 boundary flags (covers up to 1/3 of an acre)
    * Transmitter covers up to 10 acres (additional wire and flag kits required)
    * System works with multiple pets (additional receiver collars required)