Chester Creek Ctmo Computer Mouse Optical Usb Ps/2 Green One Button Wired 800 Dpi ChesterMouse is a single-button mouse with no scroll wheel made from rugged plastic. ChesterMouse is small enough to fit into small hands. A small computer mouse with no scroll wheel, about half the size of a standard mouse with one large green button that serves as the left-click. Helps young users or anyone just learning mouse skills understand what the left button does on a mouse without the fear of opening menus, etc. USB with PS/2 adapter included; Compatible with Windows 98SE, 2000, ME, XP, Vista, MAC OS 10.1.5 and higher