Product review (1 stars): DONT BOTHER...
I purchased this in January and now less than two months later, it no longer works.  We've changed the batteries on the transmitter (and what a surprise, when we opened the battery compartment it was full of water and of course rust) but the indoor unit permantly reads 34 degrees, 99 percent humidity.  It never changes. I just checked to see if I could return it, but the cut-off date wad Feb. 9, so it's all mine now.  DONT BUY THIS UNIT - it's not just that it failed, but there's no one who will stand behind it!