Not sure what these are, how to turn them on, or even what they do ?!?

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Any ideas what to do with these?Not sure what these are...  They were in my yard this morning. How do you turn them on and what t do they after they are on?
They were in my yard this morning.  How do you turn them on and what do they after they are on?

There isn’t even Brightness setting to use when the room is dark!

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