The Crybaby Low-Cost Alarm
thingiverse
This "one-way on" GE 45115 alarm system is perfect for securing a door or window, as it continuously triggers when opened. Despite its affordability, this device may prove challenging to install on irregularly shaped doors. The two-part design includes a base that houses the alarm unit and a top piece with a disk magnet. Attach the upper part to the door using string, while placing the lower part anywhere else. When the door is opened, the top falls off, activating the alarm until it's replaced. Watch this video demo: https://www.youtube.com/watch?v=r47WJlzlMjQ
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