Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 3 out of 3 did not work.

3 out of 3 did not work. Either there was a huge manufacturing error since none of the fans nor the heating elements turned on, these were already previously returned products that were inoperable, or the directions were not clear enough to decode the operating instructions. Whatever the case, we bought three, none of the three worked and we returned all three.