SODIAL(R)Black + red 2.4GHz Mini Wireless Optical Pen Shaped Mouse Adjustable 500/1000DPI for PC Android System requirement Windows 2000/XP/Vista/7 Linux Mac OS Android OS Innovative mini pen-style mouse provides accurate and easy control of the mouse cursor. Pen shaped, especially suitable for handwriting input. Low voltage alarm function, reminds you to replace battery in time. Designed with a wheel for page turning during PPT presentation. Resolution adjustable: 500/1000cpi