Just wanted to mention this, although I suspect it has been mentioned before in this forum, but I'll second it. My need is fairly simple. I need the door chime to only apply to my exterior doors (each sensor should have an option to be assigned as either interior or exterior -- every alarm system I've had before can do that, so I'm surprised). I have avoided installing a two sets of contact sensors [which I already bought] on 2 interior doors (one is the door to my home office). Unfortunately, it will chime if I go out of my office at 2AM (I'm trying not to make this time a habit ;). Really not nice. I'd leave my office door open to avoid the issue, but it has a room A/C, so that doesn't work. Manually turning the global chime feature off before I exit and then on again after I close the door will work, but it is a big pain (and I am sure that sometimes, when tired, I might forget).