Use third "lens"

Hi, the FP4 has a third “lens” or better said a sensor. And when I point with the camera against a mirror, i see that it can emit IR.
What exactly is this sensor for?
And would it be possible to use the Phone as a tv remote like the LG V20?

Kind regards

AFAIK it is a time of flight sensor used for autofocus (and nothing else).

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Would be awesome if FP would finally unlock that ToF sensor on hardware level, so we could use it for AR

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