Product review (1 stars): Piece of garbage
I suspect this thing just makes up numbers and displays them.

I placed the outside sensor right next to the display and let it sit for an hour. It is ~72 degrees inside my house.

The outside sensor says 45 F and the inside sensor says 68 F.

I have tried removing the batteries from both parts, tried placing it in different locations, using different batteries, etc. and it just does the same thing.

Complete waste of money. Do not buy.