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

I bought this touchpad to alleviate wrist and arm pain from using a mouse. It had such great reviews here on Amazon. The touchpad is too small for convenient use, and the entire device is so light that it inadvertently moves all over the place with the slightest nudge. It is not synched correctly with onscreen motion so that the cursor movement is sometimes not immediately reflected correctly on the screen. This is junk - a total waste of $43.