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LED clocks, alarm motion sensors, bluetooth speakers and whatever other appliances also get a bit warm. How would you tell a legit device from one with a milliwatt camera?

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If you walk up to it and point the camera at it, you can see a lot of detail about what is going on in the device.

Here are some pictures of some ordinary electronics for reference:

* https://imgur.com/a/Sp16EfK

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