Product review (2 stars): Don't waste your money!
I bought this unit in March of this year. It is the end of April, and I have had to replace the batteries in the outdoor unit once with the light blinking again already to replace the batteries once more. It's a shame, because other than that issue I liked the display and the readings were accurate. I will not be replacing batteries every month for this and will be looking for another product. Most likely solar powered. Don't waste your money!