This NVK dog training collar has been a game changer. Within 2 days my pup Frankie has stopped his annoying barking. I love the various settings. Now just the beep is enough to correct his behavior. I wish I’d tried this before spending hundreds of dollars on pinch collars, trainers, whistles, and various leashes. I highly recommend, and I already have, this collar to anyone who wants to safely train their pet.