I am selling a Pet Safe Collar and wireless remote control as well as the charger which charges both the collar and the control.  This system has received great reviews so I am certain that its concept works.  Charlie, an English Cocker proved otherwise.  Charlie was 3/4 years old when we bought  the system and started to use it but by that time, he had already developed his own "style" of obedience.    We had hoped to be able to take him on leashless walks but in the end the leash, a small bottle water spray and the face of Cliff Avery on a paddle that Avery's foundation had developed worked much better for us.