Instruct: Classify the given Amazon review as either positive or negative.
Query: Not a single fly caught in two weeks of use.

We had flies breeding in our numerous houseplants and bird cage. I bought and installed this in various places in open-plan room. Near floor, near ceiling, always visible, on 24-hours per day. Nothing. I had also bought the 10-pack of glue boards in anticipation of success. Nothing. Not one fly.I gave up and bought two "tangle-foot" strips. Suspended them in mid-room. 20 flies caught over 4-day period and breeding cycle broken.