Product review (2 stars): Not built to last.
This was very helpful while it lasted, which was less than one year.

After only 9 months, it began to permanently display the outside humidity as "99%". Then it stopped displaying anything for outside, and it just displays blank dashes.

I have tried replacing the batteries in both components, and the transmitter flashes every few seconds to indicate that it is broadcasting, but somehow the message is not getting through, even when the two components sit side by side.

Being pretty handy with electronics, I decided to open the transmitter to see if anything had gotten corroded, but of the four tiny screws on the back, not one of them will budge. I tried WD40 and tapping them with a hammer, but I just can't get it open. Going to have to either cut it open or just throw it away now.