EASY TO INSTALL: Containment and training kit includes everything needed to cover 1 1/3 acres of land for one dog; can be expanded to cover 100 acres with more wire and flags (sdf-wf) Contain + Train THREE MODES OF OPERATION: Included collar works with the fence boundary and the handheld remote; you choose when you want it to work with each system (fence, trainer, or both) UNLIMITED DOGS: Contain an unlimited number of dogs with additional collars (sdf-ctr); train up to three dogs with included remote TONE, VIBRATE, AND STIM: Choose between Tone (beep), vibration (Buzz), or one of seven levels of static stimulation to contain/train your dog SAFETY FOCUSED FEATURES: Transmitter features wire break alarm and built in Lightning Protector CUSTOMER CARE: Includes two-year manufacturer’s warranty; call our US-based customer care center for support on this trainer and underground dog fence system