Powered by 2.0 USB. True 5.0M pixel CMOS sensor. Adjustable LED light. Auto white balance and auto brightness balance. Magnification: 500X (combined optical and digital zoom, 500X is calculated on 21" monitor ), continuos zoom capability. Focal distance from 0 mm to infinity. The magnification factor increase as the focal distance decrease, and vice versa. Compatible with Windows 10/8/7/Vista/XP SP2/2000…