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How does a Kindle (or iPad) go to sleep when I close the lid of the case? Does it just detect something like going into complete darkness, or is it related to the magnet?

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closed as off topic by Daniel Beck May 5 '13 at 22:04

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up vote 3 down vote accepted

Yes, it senses the presence or absence, or possibly movement, of a magnet in the cover. Here is an article from someone who built their own cover, with magnet:

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