The Dogtra 2300ncp and 2302ncp Advance series has been discontinued and replaced with the new 2300 EXPANDABLE. It has all the same features as the discontinued model such as a ¾ mile range, 127 levels of stimulation, vibration mode, and a LCD screen that displays the mode, stimulation level and battery life. This waterproof system offers low/ high power for dogs over 20 lbs. with normal to stubborn dispositions. It now comes in a 1-dog system but is user expandable to a 2-dog system with purchase of the 2nd receiver-collar.