Product review (5 stars): Good unit, nothing wrong with it
Nice unit.  Contrary to what was stated in another review, the fact sheet says:
Humidity accuracy is +/-  5%
Temperature accuracy is +/- 1 degree C or 2 degree F.
Bad and inaccurate review does unnecessary harm to good products and it sickens me to write such a review.
My wall thermostat by Honeywell shows the room temperature to be 69 degree F and this unit shows 68.7 degree.
That is a perfectly acceptable variation we call can live with.  It takes one AAA battery and it works nicely.