What can you do when your pet dog or your neighbor's dog starts barking non-stop? The ultrasonic dog trainer is based on the theory that ultrasound more than 125db is above the upper limit of human hearing and super ultrasonic and strong white light. It's also a great training device to help correct your dog's barking, walking, leash training, sitting, aggression, and other behavioral obedience.What a nice pet training tool Feature - Color: Black - Material: ABS. - Size: Approx. 13.7x5.5x2.5cm. - Easy hanging or mounting on a tree, wall or fence post to keep your own dog or your neighbors dog from barking. - The ultrasonic dog trainer is based on the theory that ultrasound more than 125dB is above the upper limit of human hearing and super ultrasonic and strong white light. - To train your pets to be obedient. Can be used to help correct your dog's misconducts like improper barking, aggression, and other behavioral disobedience. - Repel wild dogs effectively and protect yourself from malicious dog attacks. - Suitable for training all kinds of dogs like those used as pets, in police and for sheep farms. - Can activate visual and additive activation to dog and other animals, but no effects on humans.