J-DEAL&reg; 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. (Blue) 100% brand new and high quality Ergonomically designed to reduce strain User convenience with wow-pen's signature, pen-grip comfort. Battery inside You pick the hand position that best suits you. Plug and play, compatible with Mac and PC.