Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Piece of junk

I just opened the package of my new mouse, inserted the batteries...and somehow, some tiny piece of the battery cover must have snapped off. Now it won't go back on. I might as well have flushed $25 down the toilet, as the thing is instantly unusable. I didn't even force the cover off, and certainly couldn't tell that something broke until I tried to put it back on. Save yourself the grief and purchase a different mouse.