Zippo Hack – How to Make Portable Zippo Lighter Alarm!

Imagine you were James Bond, an international spy who must always be keeping an eye on intruders.  You are at a secret location and you need to be able to tell if someone is at the front door, you can get a bunch of these portable Zippo lighter alarms placed at where you need to be alerted.

Hey, maybe it’s still useful if you are not a spy, you can use it to tell when your cat walks through the cat door too.

via hackedgadgets, Project Page

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