Instruct: Classify the given review into positive or negative sentiment.
Query: The jitteriest wireless mouse ever!

I recently bought this mouse as a package with the wireless Comfort Keyboard 4000. I should have listened to my inner voice which cautioned against Microsoft. This mouse jitters the cursor all over the place. Sometimes it moves quickly then stops then jumps again. It is especially frustrating when the cursor is close to where you want it and you move the mouse just a little and the cursor jumps past the desired position. New batters don't help. Changing the channel as per troubleshooting manual doesn't help. Changing the USB input as per the troubleshooting manual doesn't help. My son and his friends hate the keyboard for game playing and I hate it for frequently announcing poor signal strength although the receiver is only a foot away and new batteries and changing the USB input doesn't help. The Logitech wireless keyboard and mouse costing about half as much that I had before (disabled by a spilled soft drink) were far superior.