I own the tri tronics and have a lrg blklab that barked non stop. The first collar I had was an innoteck it was junk, I guess thats why they call them Innojunck. The TT Bark Limiter did the trick. Zeus will not make a sound when it is around his neck. I leave it on him for a couple days with out power on, and it will keep him quiet for weeks. It was by far one of my smarter investivments for the dog and peace and quiet time in the neighborhood.