With the Basic Contain N Train System you decide where your dog can go. The system uses a wall-mount transmitter and a radio receiver which is attached to a small sleek and waterproof nylon collar strap. The transmitter sends a coded radio signal around the containment wire you install controlling the distance your dog can venture before hearing a two-second warning tone. Should your dog try to leave the area they will hear the warning tone and receive correction.The Basic Contain N Train System includes a handheld transmitter that lets you retain control of your dog’s movements even away from home. By using the handheld transmitter’s “Good” and “Bad” buttons you can reward or warn your dog’s movements or actions. Use the include training flags to provide visual clues to the boundaries during training; it won’t be long before your pet knows how far it can go!