The Carson MM-840 eFlex is a powerful digital microscope that displays the magnified image right on your computer screen. The impressive 75x/300x effective magnification (on 21in monitor) allows you to see details of ordinary objects that you never knew existed! Capture an image to keep with the click of a button. You can even capture close-focus video! The included flexible neck stand with suction cup adapter attached to any smooth surface or included graduated base with ease. Max Picture Resolution: 1600 x 1200 Max Video Resolution: 640 x 480 To determine the power multiply your computer screen size by 3.57-14.29. Example: 32in computer screen would magnify 114-457x (power). Please note the effective magnification is a combination of the optical system and a high powered digital zoom. Latest version is compatible with Windows 10/8/8.1/7/Vista/XP SP2+ and all Mac OS. A USB 2.0/3.0 port is required. No batteries required.