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On mine, there's a coin-slot for locking and unlocking for a serious move - as well as a button on the bottom that releases anytime you pick it up and locks it.
I discovered that last when I put the scanner on a spongy no-slip mat and it wouldn't work. It needs a hard surface so that button is pushed in.
Sfaik, the locks are to keep the light unit from sliding about when being moved.
Edited to add: the only time I've used the coin-slot lock is when I moved the scanner from one floor in our house to another. Ordinarily, the scanner stays put, so I leave it unlocked.
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