The first one of these I bought failed around the 10 month mark. It simply stopped transmitting anything back to the console (red light no longer lights every ~90 seconds either). I reset the unit, put in fresh batteries and it worked for another 24 hours before stopping again. After several repeated attempts to get it going again, I called Oregon Scientific (who I had purchased it from directly) and they sent me a replacement.
Behold, around 10 months later, and the replacement unit has also failed in exactly the same way as the first! Again I have reset the unit and installed fresh batteries. The unit worked for ~36 hours before it died again.
Unfortunately there seems to be no alternatives to this very poor quality item. Very disappointed with the quality from OS!!