Purchased on April 12, 2025, at Bic Camera in Ikebukuro. Used for only about 30 clicks. The reason is that I already owned the cheaper M575, and I bought this product out of curiosity, but as rumored, the back/forward buttons are stiff. (This is not a defect of this product.) (YouTuber "PC Hakase TAIKI" also pointed out the same thing in a recent video.) Therefore, I find the M575 easier to use, so I have decided to sell this product. You can confirm the purchase date from the attached photos. The warranty card shown in the photos will also be included. This product has a 2-year warranty. (Some on Amazon have a 1-year warranty.) There is a scratch on the box, but this was present from the time of purchase. I believe it is in good condition, but please be aware that it has been used. Of course, the receiver is also included. (It's inserted in the box) There is a scratch on the sticker with the serial number, etc., visible when the base (photo 2) is removed. (Of course, the serial number can be read.) I think it was probably caused when attaching and removing the base. The area painted white is the serial number, so it has been hidden. (Photo 8) I have kept a record of the serial number as a measure against returns. ※ Note: The charging cable was not originally included. ※ Reference: Some other sellers are listing items as new and unused, but there is a possibility that they have used the warranty. (If you Google it, you'll find that Logitech, if a defect is recognized, may send a new product and not require the return of the defective product.) In the first place, it's strange that new and unused items are being sold, isn't it? If you are buying a new and unused item, you should check the warranty carefully. "I bought it, but I didn't use it." Is that possible for something you bought for yourself?