My husband, James, loves variety.  He usually buy several different kinds of bread - for variety, different types of ball pen -  for variety, several kinds of watches -  for variety.  This is the reason why we are having a hard time getting a training collar for my dog.  He wants variety of stimulations.  Others just have 9, there are even others who has 3 modes only.  He found out about Innotek ADV-1000P with 15 stimulations from his office mate.  He said that having variety of levels gives you a wider choice of stimulation like Innotek ADV-1000, and you will to be able to fine tune the dog’s collar and find the exact stimulation that you need.  I am so glad we have found out about Innotek ADV-1000