This device has been built for one reason only - to annoy everyone around it. What's interesting is that "everyone" is actually people with less than 25-30 years of age because this device produces a high-pitch sound of around 17 kHz. Ofcorse, it is well known fact that most people above the mentioned age can't hear those high-pitch noises.
It is based on ATtiny25 microcontroller and can be powered by 3V battery (button-cell CR2032). Source code is available for download from the author's web page.
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