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Help needed identifying a component

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Tyler Grey

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This is a picture of a doorlock PCB, and I noticed two black plastic components on the board which I can't feagure out what they are.
They have 4 pins respectively on the back of the PCB as you can see.
Any help would be appreciated.

frontSide.jpg
backSide.jpg
 

Those puppies are photo-interrupters. One side has an (IR) LED; the other side has a detector. Apparently, there are some mechanical pieces in the lock that move in and out of the slots.
 
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