Looking at one of the official Pilot's Guides shows what looks like could be indicator LEDs inside it, but it doesn't appear to be referenced.... Not that I could find.
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$\begingroup$ If you have the plane can you point your phone camera at it and see if you can see purple lights? Then it maybe some sort of proximity sensor $\endgroup$– Aadiraj AnilCommented Dec 9 at 18:44
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