Review on Hoont Electronic Dog Repellent and Trainer with LED Flashlight - Powerful Sonic + Ultrasonic Dog Deterrent and Bark Stopper by Laura Thomas

I used this product for about 3 weeks and it worked. the dogs that bark at me when I pass their yards. It works best with verbal commands. Now my neighbor's dog stops barking when I tell him "no". It took about 2 weeks to use the device along with the "No" command. Some dogs respond better to audible sounds and others to inaudible sounds. You just need to test it on each dog. You can't use it if You have your own dog, because it is not unidirectional and your dog will hear it, it will also disturb your dog, you can use it to teach your dog not to bark or something like that.