Product review (1 stars): Good for a few months (at best)
I've owned it for a little less than a year. The external sensor has never been exposed to the elements, just under the porch. Very short battery life! Even though it's not exposed, the contacts seem to crust over (not battery corrosion). I've cleaned them with short term success, but even that doesn't work often. Kind of frustrating to not see anything close to external temperature. Very cheap, but don't expect it to last more than a few months.