Welcome to my shop feature: First of all, you can drive the dog to produce super strong ultrasound, which can make the dog escape quickly. People can't hear it. Both dogs and cats can hear. When the dog hears the ultrasonic sound, it becomes uncomfortable and therefore stays away from people. Second, you can train the dog. This product can effectively stimulate the dog's nervous system, so that it can have infrared lights under the guidance of the owner, so that the dog can follow, how to train to see personal hobbies. Third, this product has three gears, one gear is the role of flashlight lighting; the second gear is to hold down the lighting. The third gear is ultrasonic and white light flash, used to train and drive dogs. specification: Material: ABS Colour: Black Size: 13.5X5.5CM Battery: You need to bring your own 9V battery (not included) The package includes: 1*Ultrasonic dog trainer wish you healthy