Function: With this ultrasonic training device, you can train your pet to obey, correct mistakes and stop barking. It can also be used to ward off ferocious dogs and avoid being bitten. Working principle: The ultrasonic energy of the product is about 125dB/30 , and the strong 2800mcd white light can produce a strong stimulation for dogs and cats (the human ear can't hear), which will cause uncomfortable and unbearable interference for animals. Small size: lightweight, does not take up too much space, so that you can carry it with you, such as jogging or walking, cycling, parks, etc. Range of action The dog repellent has a working distance of 5 meters and is a dog control device very practical. Material: The dog repellent is made of ABS, safe and non-toxic.