... pixels 4. RS-232 control visual presenter technical specificationNew High Pixels Visual Presenter22X optical zoom ,8X digital ... balanceAutomaticAutomaticAutomaticImage processing functionsPositive/ Negative,Brightness adjustment,Image freeze,Mirror,Colorful/ Black and White,Divide ... / Black and White,Divide Screen(image split)Text / Image Mode,Capture,64 image storage (save after power off) ...