DC Power(TM) Rechargeable 5D Wireless Ergonomic Vertical Optical Mouse with Wrist Pain Comfort for with 800dpi for Laptop Computer Tablet PC Windows 98/Me/2000/XP/Vista/Win 7. (Silver) 100% Brand New and High Quality . Ergonomically designed for Wrist Pain Comfort, prevention of mouse hand Five Buttons: 4 buttons in default / 1 scroll wheel (middle button) Plug and play, compatible with Mac and PC. Brand Trademarks: DC , Record Number: 86526328, more details, please check by uspto gov.