The eFlex (MM-840) from Carson is a powerful digital microscope that displays the magnified image right on your computer screen. The impressive 75x/300x effective magnification (based on a 21" monitor) allows users to see details of ordinary objects that you never knew existed! Capture an image or take close focus video with the click of a button. The included flexible neck stand (8.5 inches at tallest point) with suction cup adapter attaches to any smooth surface or to the included graduated base with ease. The graduated base shows measurements in inches and centimeters. The eFlex contains an adjustable LED lighting knob that controls the brightness of the 4 LED lights included in the device. There is also a focusing knob to ensure the sharpest and clearest images possible. The eFlex is compatible with Windows 10, 8/8.1, 7 (32/64 bit), Vista (32/64 bit), XP SP2 and all MAC operating systems. USB 2.0 or 3.0 port is required for compatibility with your computer. The eFlex is powered by the USB port of your computer so no batteries are needed. The magnification will increase with larger monitors. The eFlex is backed by Carson's one year limited warranty. This product is warranted to be free from defects in material and workmanship for a period of one year from date of purchase. Please contact Carson for additional warranty details. Please note, the effective magnification is a combination of the optical system and a high powered digital zoom.