This caused an irritating, constant beeping. I didn't know where the beeping was coming from. I thought it was my smoke alarm. But, I finally tracked it down to the control panel. I didn't really know how to turn it off, so I just pressed in the code I use to disarm the system and that worked. Other than that, I have no real problems with my ADT alarm system. I can say that I am a satisfied customer. If you're thinking about getting one, I highly recommend it.