Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not good in concrete buildings

Our establishment ordered 22 La Crosse atomic wall clocks. Only a handfull of the clocks managed to pick up a signal. The other clocks had to be set manually which is time consuming. Once they were set manually, they would not keep accurate time. According to the instructions the clocks have trouble picking up signals in concrete buildings with steel reinforcement like the three story office building we occupy. Do not purchase if you are in one of these type of buildings. Also two of the clocks did not work at all.