What exactly are all the sensors on the front?

There's the two blue-ish ones on the bottom and the one blue-ish one by the camera.....But what exactly are those? And what are the two just to the left of the top speaker? I'm sure one is probably a light sensor or something, but is one a flashing LED that has no purpose yet?

I didn't see it in any of the manuals or reviews online.

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