I just moved into a new apartment and I noticed a little plastic box above my main entry door. I opened it up (single screw on the back) and found a little pcb with a A23 battery (12v) slot. I am by no means experience in the world of circuit boards but I typed up some of the numbers on the components and identified a microcontroller (12C508A) and some kind of wireless remote controller (303.825). There seems to be a push button switch and another switch which is triggered when the door opens (or closes...). When I open the door, a little red LED blinks once.
So my totally uneducated guess is that it detects when the door is opened and broadcasts some signal.
The strange thing is that the battery in there was dead. My question is this: what exactly does this board do and should I be worried that someone (landlord, previous owner) is spying on me? I can just take out the battery to disable it but my curiosity is piqued. If it is indeed sensing when the door is opened can I use it for myself? How would I know what kind of signal is being broadcasted (if any).
I've uploaded pictures as an imgur gallery.
So my totally uneducated guess is that it detects when the door is opened and broadcasts some signal.
The strange thing is that the battery in there was dead. My question is this: what exactly does this board do and should I be worried that someone (landlord, previous owner) is spying on me? I can just take out the battery to disable it but my curiosity is piqued. If it is indeed sensing when the door is opened can I use it for myself? How would I know what kind of signal is being broadcasted (if any).
I've uploaded pictures as an imgur gallery.