Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Did not work

I ordered this product and it arrived promptly.....however, I was bummed that the thing did not work. I took it down to Radio Shack to get a DC power adapter. The employee tested one out that he thought fit and it did not work. He said, "This thing works right? I told him I did not know, I just got it and never had a battery in it. He loaded three C batteries and it still did not work. It was a defective unit. Contacting Amazon to return this....