Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Bought two, both failed.

I bought two of these outlets. I put one in the greenhouse when it was warm. The temperature dropped to 25F and the heater was not on when I went out there. I put the other outlet on a heating pad I use to keep my pipes from freezing. It was working on the heating pad and when I moved it to the greenhouse the heater worked at first. The temperature in the greenhouse began dropping again, I checked the heater, and this outlet had failed also. I would not buy these and hope to get a refund on these.