Usage Tips:Description What can you do when your pet dog or your neighbor#39;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#39;s also a great training device to help correct your dog#39;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#39;smisconducts 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.Packing list: 1 x Ultrasonic Dog Repeller