The Promotion Activity Mountain Ultrasonic Pet Dog Puppy No Barking Household Training Tool Device Anti Barking House for Animals 50ft Uses ultrasonic technology to stop barks Safe and effective for all size and breeds of dogs.This device with battery operated. Detects barks up to 50 feet with the use of an internal microphone and 4 levels of operation including a test mode Sensitive microphone isolates and picks up barking up to 50 feet away to stop barking both outdoors. Designed for easy hanging or mounting on a tree,wall or fence post to keep your own dog or your neighbors dog from barking