Some ultrasonic devices feature LED flashlights to shield you from Puppy assaults even at midnight. They're safest to carry in the evening, particularly when you suspect the existence of aggressive dogs. For such a device to get efficient, it’s critical the dog continually associates the ultrasonic sound with its barking. https://pawpressnews.com/best-dog-deterrent-device-for-dogs-the-ultimate-solution-for-bark-control-and-training