A weird device in my home's ceiling

MisterBill2 said:

Why would a lights control (occupancy sensor) have connections for ALARM and TAMPER???? And where is the cover with the lens.

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I use a standard PIR to switch on lights in my garden room as the double-aspect bifold doors puts the nearest wallswitch 2.4m from the entrance! The fact it says 'Alarm' doesn't preclude its alternate use. I removed the standard lens so as to make it more general in its sensing rather than its normal focussed motion action.

I'd guess there's a more expensive version of the device that has a cover switch connected to the tamper inputs - 1 PCB, 3 products!