Product review (4 stars): Good value with a small margin of error.
This device tells you the relative humidity both at the location of the display and at the location of the remote sensor.  It also tells you the temperature at both locations.  If you demand precision, you may not be satisfied with this product.  It is a degree or two different on temperature and a percentage point off on humidity when both units are placed side by side.  If you are not concerned about a plus or minus 1% margin of error, then this product is a good value.