Vitiny UM20B-CSZ064C Digi Microscope directly connect to monitor, plug and play. There is built-in 5 objective lens and coaxial light. The parfocal distance at WD 82mm allows continuous zoom from FOV 4.65mm to 0.7mm and larger magnification. BY the way, it is flexible to change the other C mount zoom lens and obtain different parfocal distance. The function of defog  can enhance the contrast and mirror reverse image etc.