Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good idea, stopped functioning after one use.

I bought this product because it fit my specific wants. The battery was dead, I replaced it and it worked fine. I tested it for two or three trial periods to which it recorded fine and data transfer worked great. I used it for one long event; the logger recorded for the entire 5 hour span and data was retrieved fine. Now it does not work at all. Battery registers fine, but the unit only blinks red twice which does not coincide with any patterns in the manual. I've tried it a couple of times since then with no luck. This item is useless to me now. Great potential with a great first couple of uses, then dead and useless within three days.