I am renting a condominium and the main control panel of the security system started beeping every 45 seconds. This seems to indicate that there is a battery low in one of the wireless remote sensing devices. There is only one device so I took the cover off of it but I cannot see a battery. Any idea what I am doing wrong? I don't want to break anything so I'm not prying anything off. The system seems to be a Honeywell Ademco or something like that.
Any advice would be appreciated.