Powered by 2.0 USB. Real 5.0M pixel CMOS sensor. Adjustable LED lights. Auto white balance and auto brightness balance. * Magnification: 0.1 ~ 500X (combined optical and digital zoom, 500X is calculated on 21" monitor ), continuos zoom capability. Focal distance from 5 mm to infinity. The magnification factor increase as the focal distance decrease, and vice versa. To change focus, please rotated the knob at the end of the microscope body. * Compatible with Windows 8/7/Vista/XP SP2/2000 32/64 bit, Mac OS X 10.5 or above, Linux. For Mac, please simply use Photo Booth or FaceTime to open the device, no driver or additional software needed. Measurement function, including length, arc, rectangle, distance measurement and etc. is only available on Windows based operating systems. * Microscope diameter is only 17 mm, length is 126 mm. All Supereyes microscopes are protected by strong, light, skinny and environmental friendly aluminum alloy body. * Snap shot and video recording functions. Photo format: JPGE. Photo Capture Resolution: 2592 X 1944, 1600 X 1200, 1280 X 960, 960 X 720, 640 X 480, 320 X 240. Video Capture Resolution: 320 X 240. Video format: WMV for Windows systems, AVI for Mac OS. Maximum display speed 30f/s.