Can dog repellent catch Tibetan mastiff? Is the dog repellent true?

Ultrasonic dog driver is a new patented product, which is not only light in appearance, but also comfortable in hand. It is worth mentioning that its circuit adopts the working mode of pulse modulation scanning, generating strong ultrasonic wave of 125dB and strong white light of 2800mcd, which can strongly stimulate dogs, Tibetan mastiffs and cats (inaudible to human ears). Used to effectively expel evil dogs, cats and Tibetan mastiffs; When using the dog training equipment, the ultrasonic head emits relatively weak and stable ultrasonic waves to train pet dogs, military dogs, police dogs and Tibetan mastiffs to complete specific actions. Even the fiercest dogs need not be afraid.