Product review (4 stars): It could be better, but so far it works
It could be better, but so far it works. It does use a battery. Which also sucks. But so far its keeping my temp. My thermostat is off by like 10 degrees. I even reset it and it set correctly for 30 seconds then went back to the wrong temp. So I got this to see if it could tell me the room temp. So far its working.