Someone gave me a working G400S today, and my old MX518 is still functioning. Had already upgraded to the Deathadder V2 a while back but the MX518 still works. Had to open
Amazon.com: Logitech G Optical Gaming Mouse G400 with High-Precision 3600 DPI Optical Engine : Electronics
Original package Logitech G400s gaming mouse| Alibaba.com
should i get a G400 or G400s - FINAL UPDATE: 3 x g400s defective in a row, , asked for refund | Overclock.net