Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointed

I bought about five of these for Xmas gifts plus one for myself. They were okay at first, but none of them work now. My friends were embarrassed to tell me. The product doesn't hold the "crank" charge and even then, not all the lights work. I took one on a camping trip, and it was of no use. Furthermore, I contacted Amazon to help me contact the company but they had no information. I also could not find this company online with contact information.