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What is this item on a circuit board?

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chipner

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I keep seeing this on PCBs. It is less then a cm long and a few mm wide. Can someone tell me what is it and what its function is? I can't seem to find out.
0038 06-08-2015 12.15.15 PM .jpg
 

It is a crystal. It is used in an oscillator circuit to generate a stable frequency.
 

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