I own the original Microsoft Mouse and ordered this mouse more out of curiosity. She looks virtually identical, they do not work properly. The left key worked sometimes, sometimes it was as if you would press the right button. After all, the scroll wheel worked flawlessly in the middle of the sample. As the goods come directly from Hong Kong, a normal return and refund is not possible. You must write to the seller, waiting for his answer. After all, after two polite inquiries by the seller, the price was then returned immediately. Plus an apology: "This incident and the inconvenience to us do really very sorry We would like to inform you that we have already initiated a payment refund in full on Amazon It takes about 3 to 5 days, to Amazon payment refund.. has made the full amount on your credit card or Amazon gift card in accordance with the vendor support. Therefore, your patience will be greatly appreciated. " For a star comes separately.