Bests & Worsts Reviews from Amazon

I bought 5 of these. The system concept is good, as is the setup. But after only a month in service, one of them is giving false alarms and won't respond to pressing the button to silence or reset. So I guess it's $50 worth of trash now. Keeping my fingers crossed on the other 4... Update: Well, I ponied up and bought a replacement for the failed one, and guess what: it was faulty right out of the box. It would not link to any of the others, even though it is the identical model. So I've now bought six of these, and two are faulty. Downgrading this product to 1 star for extreme unreliability.