PETCOMMAND-R Train behavior and control barking with the press of a buttonFunctioning range of up to 20 feet. Features a harmless signal emitted with a simple button. This helps condition your dog to respond to verbal commands. For a more stringent approach to barking select �Bark Control�. The separate clicker button provides an audible cue to help train your dog. Built in 4 LED light comes in handy for evening walks. Requires 3 AA batteries, not included.