I had a bad experience with a microsoft wireless optical mouse. The problem wasn't the mouse it was the battery in it. I was just using it one day when it popped up in my hand about 2 feet. I then looked at it and 5 minutes later realized the battery exploded and was oozing battery acid inside the mouse. When it was all cleaned out I put new batteries in and it didn't work. So I now assume that it fried the chip inside of the mouse.