First they try to get you to buy everything. Get only what you need. It is a very good system until you have a problem. My cameras lost connection and one person finally said they would fix free. Tech came and wanted $58 for call and $169 for first half hour. I said no. So I've been paying like $75 for over a year for non working cameras. ADT is a rip off. Laws against ripping off elderly, getting lawyer