An ultrasonic bark deterrent thus creates what you might call a landscape of fear: the dog is subjected to frightening stimuli at seemingly random times, in random places, when doing random things ...

Punishment Are Ultrasonic Dog Training Devices Really Safe and Humane? These popular training devices may spell trouble for dogs. Posted January 13, 2020 | Reviewed by Ekua Hagan ...

Dog repellent frequency. The ultrasonic dog repellant uses a standard 555 timer IC1 set up as an oscillator using a single RC network to give a 40 kHz square wave with equal mark/space ratio. This ...

BarxBuddy emits ultrasonic noises that are inaudible to most human ears – but audible to dog owners. Some humans may hear a distant, high-pitched noise when activating BarxBuddy.

People can hear them, if a person can hear them, a dog can hear it 10 times worse," Evan Fried, director of training at Big Dog Ranch Rescue, told WPBF 25 News. "They’re extreme deterrents.