- The principle of the dog repeller: This product ultrasonic dog repeller is mainly used in the outdoor environment to prevent being attacked by dogs. When encountering a dog that tries to attack you, you will take out this “super weapon” ultrasonic dog repeller, which will emit ultrasonic waves to the dog, and the 130dB ultrasonic wave will attack the dog. The auditory stimuli are great. The flickering of the super-bright LED can also make the dog clear the source and position of the sound, so as to understand that the weapon in your hand is aimed at it. 2 How to use the ultrasonic dog repeller: (1) The ultrasonic dog repeller can be illuminated: toggle the gear selector switch below the product to the “Light” gear, press the button switch “ON” above the product, and it can be used as a flashlight. (2) How to train the dog with the ultrasonic dog repeller: Toggle the gear selector switch below the product to the “Train” gear, and press the button switch “ON” above the product to