(3 of 4 customers found this review helpful)
We have had these units for at least seven years. Initially, we had a problem with all units reporting low battery prematurely. All were replaced at no cost, and alkaline battery life has been about one year. (Because of the initial battery problems, I started noting the date of each battery replacement on a small piece of paper taped in the back of each unit. Since the life is sometimes a little less than a year (battery make? time unused on shelf?), I recommend replacing batteries when the units report the need. (If you are away for an extended period, run the test.)<br /><br />These detectors are located near the kitchen, near our bedroom (just my wife and I are here normally), in another furthest bedroom, and at the foot of the basement stairs. Because these units form a network and repeat each other rather loudly, that is something to keep in mind when choosing where to place them, aside from assuring that all risk areas are covered.<br /><br />The kitchen detector has gone off two or three times, properly. The third time, a house guest was cooking with oil and got the oil much too hot. There was much smoke in the air.<br /><br />Now, about a month later, the alarm spoke an announcement twice. I did not quite catch what it said. Then the kitchen alarm, by itself, beeped every minute or two. Batteries tested slightly low. New batteries (tested first) installed: alarm still beeping. Pressed the test button. The alarm announced testing, followed by the others, then the usual sequence, until I heard something like detector error reported in kitchen smoke alarm, see owners manual. Not a word about this in the one-sheet manual. Also no help at the manufacturer's web site.<br /><br />Also not in the manual. I did not want to hear the beeping once I knew what it meant, and put the battery holder out. Then I tested one of the other detectors to be sure the others were communicating. The network re-established itself without the kitchen detector. I don't know if this was necessary, but would recommend it as a precaution.<br /><br />These alarms were warranted for five years. The manufacturer's site now indicates they are warranted for seven years. I suspect the detector error is the result of fouling by too much smoke, but it could just be too old. I will know only if the others start failing.<br /><br />I intended to replace the failed unit.<br /><br />They are a bit expensive, but provide voice announcements identifying the problem and its location. The voice network feature justifies the price.<br /><br />They are easy to remove from the base, usually in order to replace the batteries (and test), and relatively easy to remount on the base.<br /><br />While the owner's manual, I now know, doesn't tell you all it probably should, that is a minor flaw.
How long have you owned it:
More than six months
Yes, I would recommend this to a friend.