A DT Systems training collar is an effective and reliable way to train any dog. Its waterproof receiver and weatherproof transmitter system feature a generous range of up to 2/3 mile and has 16 levels of intensity for maximum control.The CT-2000 Trainer has continuous, momentary, vibration and vibration plus stimulation. Maxx-Range™ internal FM radio frequency antenna is woven into the collar. Rechargeable transmitter and collar are powered by NiMH batteries (included). Turn your unit into a multidog trainer (up to three-dog capable) by purchasing the Add-A-Collar (sold separately). Imported.