What is the sensor on the top of the laser module?

I’m looking at switching to the laser module, but was going to first print a ventilation system (attach the blower and sucker from a cheapo shopvac to the laser head to provide a constant air flow over the cutting beam so ablation stays high), but while looking at the head, I see this odd black square on the top. From the looks of the 1600MW head purchasable on the store, it’s no longer a thing, but I opened mine up and it’s apparently wired into the inner electronics, so it’s doing something.

Does anyone have any idea what this thing is?

It’s the antenna for bluetooth to communicate with the controller.


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