Actually I Called Logitech Monday because my G400 has a broken connection in the wire where it enters the mouse. They approved me for a replacement and they are sending me the G400S was so happy as I like this style of mouse I have had a couple MX518's. After the last one started to fail in the wire near the plug I called to find out it was out of warranty but they gave me a discount to use to get the G400 last year.