Carson eFlex 75x/300x Effective Magnification (Based on a 21" monitor) LED Lighted USB Digital Microscope with Flexible Stand and Base (MM-840) Powerful USB Digital Microscope with 75x/300x Effective Magnification (Based on a 21'' monitor)| Contains Adjustable LED Lighting Knob and Focus Knob | USB 2.0 or 3.0 Port Required The included flexible neck stand with suction cup adapter attaches to any smooth surface or the included graduated base with ease | Microscope Dimensions: 1.25 inch (L) x 1.1 inch (W) x 3.45 inch (H) Capture an image or close-focus video with the click of a button | No batteries required Compatible with Windows 10, 8/8.1, 7 (32/64 bit), Vista (32/64 bit), XP SP2+ along with all MAC operating systems. Backed by Carson's One Year Limited Warranty