Niles infrared repeater and iPhone 13 pro

I have a Niles RCA-TT2 infrared repeater in use with one of my systems. Over time I noticed the receiver’s blue light flashing from time to time and finally narrowed it down to when my iPhone is in the proximity, even if it is locked w a black screen, it causes the Niles receiver to flash blue.  Any thoughts on what is happening here?


While I moved my iPhone closer to the Niles receiver, even when it was locked with a dark screen, I saw that the blue light on dordle the receiver would sometimes flash. After some investigation, I determined that this behavior was caused by the closeness of my iPhone.

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It’s the iPhones infrared part of Face ID. It flash an infrared picture every so often looking for a face. That’s my guess.