Ultrasonic Barking Stop : This device uses ultrasonic technology to effectively stop dog barking, ensuring peace and quiet in your home. Dog Driving Device : The dog driving device feature allows for remote control operation, making it easier to manage your pet's barking behavior. Noise Prevention Training : Designed to prevent noise pollution, it serves as an excellent training tool for dogs prone to barking. Automatic Dog Barking Stop : The automatic dog barking stop feature provides instant action when your dog starts barking, immediately stopping the noise. Origin : Mainland China Item Type : Bark Deterrents pay attention: This product triggers the product to emit ultrasonic waves when the dog barks at a certain decibel level. The ultrasonic waves will make the dog feel uncomfortable. After repeated repetitions, the dog will know the cause of his barking and stop barking. Some dogs bark even louder when they emit ultrasonic waves to make themselves uncomfortable. This is because they haven't realized that the discomfort caused by their own barking makes them bark louder. There needs to be an adaptation process. This ultrasonic wave has three gears. It is best to change the frequency regularly when using it, because this kind of ultrasonic wave does no substantial harm. You will get used to this frequency after a while and will not be afraid anymore, so you should switch the frequency frequently. Strictly trained dogs and dogs with immature hearing will not be effective. Those who mind are advised to proceed with caution. Features: 1.Adjustable frequency 2.multi-position 3.light weight Specification: Size:11.5*5.5*9cm Weight: 190 Packageincluded:1*A window screen Due to manual measurement error of 1-3 centimeters, it is within the normal range.