Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Solar Mole & Gopher Chaser - High Failure Rate

We purchased five of these units and sadly report that three of these units have already failed after a month of use.They have a solar cell on top which powers a burst of 400 Hz sound every 30 seconds. They use no batteries. A great idea but I just wish they were reliable.They only come with a 6 month guarantee - that's the first RED FLAG.. Only one season of use and they write off their responsibility.. Also the instructions state that the unit is not water resistant and it's not sturdy enough to withstand freezing temperatures!! - ("Remove the unit from the soil if the ground freezes or when flooding occurs)"