Product review (5 stars): it works fine
I have the remote (the sending unit) mounted on the far side for a telephone pole about 100 feet from my house. It works fine in my living room.  If I move it to my kitchen just 20 feet away it fails to receive the data from the remote unit.  There are no walls or anything else to interfere with receiving the signal. Other than that it works great. I would recommend  this unit.