Bought two of the wired version of this thermometer. Both ended their useful lives when the display (which looks pretty much like this one's) started dropping segments of the digits. They spent their lives attached to an indoor wall, so they pretty much just stopped working. I got a few years out of each of them but this sort of device should last much longer than that. I liked the big display so much that I was willing to given them the benefit of the doubt on the first one; however, I doubt I'll be buying a third one or any other Oregon Scientific device.