Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: does nothing in front of the dog's face
Review: I bought this product to quiet our neighbor's dogs who bark viciously any time we go into our own backyard. I tried it out on my mom's border collie in the audible mode. I held the thing RIGHT in front of my mom's wildly barking dog and it made no sounds whatsoever- this is in the audible mode where it should emit a sound that humans can hear. I tried it in the other mode in front of the barking dog as well, but there was no effect on her wild barking. I decided that if this does nothing right in front of a barking dog's face, then it is unlikely to work from 50 feet away. I am disappointed and obviously returned the product.
