Sirs, We have had a Dog Guard fence for nearly two years and not only are we completely satisfied with the system, but we do not hesitate to tell our friends and co-workers of our satisfaction. The mechanics of the system worked as promised, even the battery back-up, which living in Vermont has come into service several times. We are most pleased with the training Dog Guard supplied at the time of installation. Our dog broke trough the fence only once, early in the training process, and now does not even need the collar on to respect the fence. The training, for our dog and ourselves, provided by Dog Guard was essential. We are very happy we did not buy a system and both install it and train our dog ourselves. Thanks. TJ and Ken Norris Rastus (the dog) 241 Burrington Road Pownal, Vt. 05261