Title text:
With a good battery, the device can easily last for 5 or 10 years, although the walls probably won't.
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Source: https://xkcd.com/3100/
this post was submitted on 09 Jun 2025
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There is a PCB make it Yourself Project that was very low power and played a cricket sound at random intervals. It lasted Years on a coin cell. Don't use this on mentally unstable people!