04-26-2005, 01:23 PM
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Member of the north
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Join Date: May 2003
Cobra Make, Engine: A Cobra
Posts: 11,207
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Ultra sonic transducer - sends a signal just above the human hearing range. Like a dog whistle. They are used for thinks like tapeless measuring devices and back-up distance indicators.
The bark free thing probably gives a burst in the ultra sonic band for a short period. It would be really nasty if it was on all the time, drive the dog nuts. 
Steve, let us know what you end up with.
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