Negative Positive
Title: Quit almost immediately
Review: On the first day of testing some dogs seemed to notice it, others didn't. By the second day out, all dogs paid it no mind at all. Being a service tech, I opened it (easy to do) and found the oscillator did not always kick start and the switch had to be pressed hard to make turn it on (merely clicking it didn't always work.) But even when the oscillator was running (as shown by an oscilloscope connected to the output to the transducer), a small microphone connected to the oscilloscope, 2 inches from the transducer, would only occasionally pick up any output, and that usually quite weak. I think there is something wrong with the transducer. Either that or the dogs in my neighborhood are all deaf. My own dog doesn't even turn his head if I blast him with it only 5 feet away (from behind). After writing this I am going to hunt around for a way to contact Amazon for a replacement or refund.
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