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ultra sonic transmitter that Birder's promote since it is humane. It acts like a motion light, but instead of lighting up, it turns on a high-freq high dB driver that is above our hearing range. It isn't like these stupid xmtr's that are supposed to rid your home of insects, etc., It is actually a HF compression driver with a steady tone above 20K. It is also great for keeping dogs and cats away I've read. A neighbor got one and he claims it got rid of paw prints and droppings on his car. I used to have a problem with a particular dog wetting the wheels on my car years back. A fence charger hooked to the wheel cured him.
Regards Sweep 
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