Product review (1 stars): It doesn't work.
I already wrote a review shortly after I got it.  At that time it was working.  Then I noticed I wasn't getting the correct outdoor reading.  I replaced the batteries even though it was rather early to do that.  The two parts of the devise were once again synchronized.  It worked for a week or so, and then stopped working again.  Today, I have the very same outdoor reading, 35 degrees--the piece that goes outside is still there--even though the temperature has ranged from below zero to around 50 above.  I gave up and bought a cheaper, less complex piece of technology using a wire that runs outside the window.  That has been working quite well for the last 3-4 weeks.  Something is very wrong with this particular thermometer, but I have not idea what it is.  My original review should be removed now.