Extreme Dog Fence is a reliable and effective underground dog containment system that provides a safe and secure boundary for your pet. It features a durable and waterproof collar that delivers static correction to deter your dog from crossing the boundary. The system is easy to install and can cover up to 25 acres of land. With customizable settings and a long-lasting battery, Extreme Dog Fence is a great solution for pet owners looking to keep their dogs safe and contained.