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Vehicle Information: Model: 911; Year: 1988; Body Type: Convertible; Engine (type, size, modifications): 3.2; Total Mileage: 36000;

I purchased Victor brand ultrasonic devices at my local Ace hardware sold as a two-pack @ $19.95/pkg. They are small round transducers that produce oscillating frequencies between ~40KHz-60KHz (considerably above the human hearing range at a decibel level that is sufficient to drive away mice, birds, squirrels, etc). Ostensibly they radiate their output in a shotgun-like spray pattern as opposed to a rifle shot straight line. I placed them on both sides of my garage at opposite sides of where the car is parked. Said another way, with the nose of the car facing forward into the garage, one of the units is "aimed" more at the hood end of the car and the other is "aimed" more to the engine compartment end of the car. My "evidence" that they appear to be working is simple. Historically, there were mice droppings in many areas of the garage, especially on the storage shelves where I keep the rags, towels, paper towels, etc. that I use to maintain the car. Since installing the devices and doing a very thorough vacuum of the garage and shelf units a few weeks ago, so far at least there have been no mice droppings, leading me to conclude that, at least for the time being, the mice are being sufficiently annoyed by the noise to be driven out of the part of the garage where the car is. I have read that over time, the units deteriorate and need to be replaced and that rodents "learn" to adapt to the "noise" so that it becomes tolerable to them. I'll keep you posted. Hope this is helpful/useful.

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