What is the 2nd sensor on the front, right next to the ear speaker for, and can I cover it up with a screen protector?

I received a package of screen protectors from Tech Armor today that were advertised to work for the iPhone 5, 5S and 5C. They don't have a cutout for the second sensor on the front face that is to the left of the ear speaker.
What is that sensor for? And can I cover it up with a screen guard without reducing the functionality/effectiveness of the hardware?
Thanks,
Pete.

That's the proximity sensor, senses when you have the phone close to your face, turns off the screen to save battery and prevent accidental input from face touching the screen.
It's ok to be covered by by a transparent screen protector. I have used screen protectors that cover up that sensor, no problem.

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What is the 2nd sensor on the front, right next to the ear speaker for, and can I cover it up with a screen protector?

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