Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not as good as the solar ones

I have used the solar version of this product for 6 months and they work perfectly. The moles hate them! I thought that this battery operated one would work the same but it doesn't. After putting in three batteries, the units aren't reliable. I've found that they stop working and I'm not sure why. I bought several and they all work that way. The solar version is extremely reliable.