I spent almost $400 including extra motion sensors. Was very excited to get it, but as soon as I put a battery in one of the sensors (never even plugged the base in), my house alarm went to trouble. I tried for over a year to get it resolved, but was continually told to try something else (move this, turn on before you reach the house, etc...) I called my house alarm guy and he said the frequency should not be the same, but they conflict for sure. I can't say if this works at all, since I don't have another house to try it out on. Super disappointed. I will say, that when I called, I always got a very nice man who seemed like he was trying to help but never offered a refund or a solution that would work. I bought a cheap unit that didn't work well, then spent a good amount on this and it still didn't work well.