No they can't.
But with a partial system, you need to hope the burg breaks in one of the three doors (actually 2 doors, because they're not likely to come in through the garage-house door).
Here's what you do...go to ADT's web site and configure your alarm system with their online calculator...but configure a full system, all doors & windows a motion or two. This way you'll see what a real system will cost you from them. Then call a couple of reputable locally owned alarm companies in your area and get prices from them.
The 20P is a good system, I've got a lot of them out there and have no problems with them.
1 | >> control panel, three doors alarmed, 1 smoke alarm, 1 quick key, 1 motion | > all | >> installed. monitoring $30.99 a month. | >> upgraded talking control panel is $85.00, Premiere package is the same, | >> I | >> think, plus cell guard cell phone alerts, security link, for $973.00 plus | >> additional door, four windows armed for $1323.00 | >>
| >> What do you think? | >
| > Vista-20P, its a decent system | >
| | Is it a Vista-20P system? Can the bad guys defeat a wireless system? | Should I insist on wired door alarms? | |