h a l f b a k e r y
It's as much a hovercraft as a pancake is a waffle.
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A standard mousetrap (dead or alive) with a low power radio transmitter attached.
The transmitter "pings" once a minute, and could even relay useful information; temperature is the obvious parameter.
When the trap is sprung, the signal stops. The receiver generates a visual and (optional) audible
The system is "positive-fail" as it will alert on a flat battery too. This is in case the trap is set in an unfrequented area where it might catch a mouse but fail to signal due to a flat battery.