The SPT 2420 for one dog is D.T. Systems" top-of-the-line trainer system so you can get top-of-the-line performance from your dog. This 3.2 mile range collar system has 50 levels of momentary (or Nick) and Continuous Stimulations. Carefully designed to include the tools you need to successfully train your dog, it also comes with features like Vibration, Jump Stimulation and Rise Stimulation. The Vibration feature vibrates the collar units allowing for a variety of training methods. The Jump Stimulation allows you to “jump” to a self-programmed intensity level that is different from your normal training level. Rise Stimulation gradually increases stimulation while holding the Rise button down. The collar unit and the transmitter are completely waterproof.