Product review (1 stars): Not Accurate and Not Reliable
Bought this unit and it never worked right.  The indoor and outdoor units never synced up on temperature or humidity even when placed within a few inches of each other.  I compared to other accurate thermometers and they were always 1-4 degrees different and up to 6% different from each other on humidity readings again, even when right next to each other.  The indoor unit took a very long time to adjust to changes (like 20 minutes or more) in temperature. Then the outdoor sensor stopped working altogether after just 2 days.  Needless to say, I returned for a refund.