Product review (5 stars): This is a very nice looking unit
This is a very nice looking unit. It has a large display so the numbers are very easy to read.
I like that it also displays the humidity percentage for inside and outside.
We placed the outside sensor in a permanently shaded area under our covered back porch as it needs to be out of direct sunlight for an accurate temperature.

Requires four AA regular alkaline batteries (2 for each unit), but if the outdoor temperature gets below -4 degrees F, then it says the outdoor sensor will need 2 lithium batteries.

Says the outdoor sensor and the display unit need to be within 165 feet of each other.