Pet-Agree - PET-AGREE produces a silent humane high frequency sound that helps emphasize your verbal commands and keeps your dogs attention while training. Use the PET-AGREE for only a couple of seconds each time you give a command to reduce training time by reinforcing the command. Made of high impact plastic with a belt clip it can be used indoors and out. A humane alternative to choke chains shock collars or other physical means. Made in the USA includes the 9V ENERGIZER battery. Perfect for trainers kennel operators andbull;and pet owners that want to help their pet behave better.