This is not the first time I buy a vertical mouse not at all because it goes out of order (I use one for several years), but my household, children, and now my grandchildren are growing up. For me the difference is noticeable, the hand is less tired and generally comfortable. I am grateful to everyone, without exception, who took part in making me use of excellent products.
Received. Packed in a bag. Works. Too big for me. Quiet, the buttons are almost inaudible. I recommend it. Did not communicate with the seller.