Product review (4 stars): Good unit for the price
It's easy to use and accurate, plus affordable. The only downside is the battery life of the outside unit. I've had mine for a year and a half now. The inside unit is still on the original batteries, but the outside one is beginning to kill batteries more frequently. I don't honestly remember if I had to change them in the first year but I noticed this winter that they were dying more frequently. I began keeping a record of every time I had to change them a few months ago. I went from 3 months to 18 days for the last set. I thought maybe it was the winter cold doing it but the weather is warmer now, so that isn't it. Besides that problem I'm pretty happy with it.