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Small photoresistor sensor module is about 0.57" X 0.72". It has a CDS cell photoresistor and an on board resistor. Great for light sensitive robots, alarms, dimmer circuits, etc. What you see in the picture is what you get. No schematic or documentation included. You can search the internet for hundreds of how to articles for applications. Sorry, we can't provide any technical help for this item.
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