Instruct: Classify an Amazon review into positive or negative sentiment.
Query: buyer beware

This product simply did not function with my computer (Compaq Presario V2000 laptop), either with internal Bluetooth or the Microsoft dongle. In both cases, the Bluetooth software recognized the keyboard and the mouse as being wirelessly connected. But neither the keyboard or the mouse had any effect on my computer, despite thier ostensible communication. They were simply dead. So I now must go through the hassle and expense of returning this ballast (you do pay for shipping on returns).