The Solidstate Pet Containment R024165P K-9 Collar & Receiver Kit #9020 is a high-quality electronic fence system designed for training and obedience of dogs. The receiver collar is a single unit that allows pet owners to control and contain their dogs within a designated area. With the Solidstate Pet Containment brand known for its reliability and durability, this product ensures that pets stay safe and secure while allowing for freedom of movement in a controlled environment.