The Sport Junior G3 (one dog) is especially designed for the first time e-collar owner. If you are interested in developing a well behaved dog that you will be proud of and have fun with, the Sport Junior is a ;must have training tool. Tri-Tronics has combined the reliability, quality and ruggedness of our a professional systems with the simplicity that will allow virtually anyone to effectively and easily train their dog. The Sport Junior is affordable for anyone interested in training their dogs. 7 levels of stimulation, continuous and momentary stimulation, waterproof receiver, battery life indicator light, replaceable batteries, lanyard, 2 year comprehensive warranty and manuals.