Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Pest Repeller Failure

This is the first and only product I have obtained from or through Amazon that is a BIG dissapointment! Yes, I took a risk, but this item is worthless. I tried contacting the seller, but get a run-around. Still trying to figure out who to talk to at the manufacturer. There is a restocking fee that costs more than the device! I had an ant infestation all-of-a-sudden. Hoped chemicals would be reduced or eliminated. Installing this device, the problem became worse than ever. Maybe I am safe from opposums inhabiting my home, but for insects, this product is worthless. It does NOTHING as suggested. The only plus is they originally shipped it very fast. I had hoped that in this day and age of technology, something of this nature would actually work. Apparently we have yet stuff to learn...