Product review (2 stars): Good unit. Low Battery indicators not sensitive enough.
I've had one of these units for about a year now. Generally pleased with it. Accurate near as I can tell. Easy to read and operate. Reasonably clear instructions. My only problem has been that the low-battery indicators don't come on soon enough. After a few months, I started noticing that the both temps were reading 3-5 degrees high compared to my furnace thermostat and the local weather station. The low battery displays didn't come on but I changed the batteries just to see what would happen. The temps came right back into agreement with those other sources. Same thing just happened again. If you think the accuracy of yours is starting to drift, see if changing the batteries helps. A couple of enhancements would be nice:
-  Plug in power supply for the indoor unit.
- Option to choose whether indoor or outdoor data is on top.

Edit 2 days later: Guess I spoke too soon. Both temps are still reading 3-4 deg high. Another set of new batteries didn't help. Guess it's really drifting off. Still usable so long as the error doesn't get much larger or starts changing so fast it's not predictable but it's still disappointing.