Product review (5 stars): No bells and whistles - well worth the money
Simple. It works great. I did have to find a protected place to put the outdoor sensor. My old house had timbers bracing up the roof, and I just put a nail on the protected side. My new place doesn't have that. So I stuck the sensor in a Ziploc freezer bag with a tiny pin-prick hole in it (for humidity), and put it in a window between the glass and the screen, on the north side of the house. The snow and rain can't hurt it.