This would be to affect dogs & it would be directed through the neighbors window. The goal is to make them bark not stop it. I was reading the ultrasound transmitter should be at 25-30 KHz. The point of all this would be to make the dogs bark while they are indoors so hopefully, the neighbors will train them. They leave the dogs outside all day & force the neighbors to listen to the dogs bark so they need to be forced to listen to the barking inside their home at night. Maybe then they will train the damn dogs.