BarxBuddy is a handheld device that allows you to do 1-ON-1 training with your dog. Use it to reinforce training commands and stop undesirable habits such as barking at the door, or jumping on the furniture. 100% harmless to dogs, humans, and all animals. Uses a 9 volt battery which is included in the package. See Photos For More Details. Used a couple of times and now our fur kids listen,