Product review (1 stars): Probably OK for the price but humidity readings is way off.
I have had an Active thermometer and atomic clock for a number of years with no problems. A couple of years ago we got a different brand indoor/outdoor thermometer. Now I just purchased this active model. One reason was I thought it would synch up with the existing outdoor sensor so I would not have to hang a third unit outside. Unfortunately it seems the outdoor sensor are different so I ended up having to hang the third one anyway. All the indoor units are in different rooms so I have not tried to compare those readings, the three outdoor sensors are all within a few feet of each other. All the outdoor temp readings are within one or two degrees. The humidity readings are a different story, they are all over the place. This new unit seems to read the outdoor humidity 30% lower than the old u it and the indoor humidity about 10% higher. At the moment this new unit is reading 6% outdoors and I am positive it is not that low and would expect it to be somewhere around 40%. So I am disappointed that it would not synch with the old sensor and that the humidity readings are so far off.
Update, I tried the hard reset and now the outdoor humidity is reading 1%  where it should be up around 40%
Update #2, I just lowered my rating to one star, this thing is absolute junk, it is currently reading the outside temperature at 158 degrees, in the shade, in Seattle.