... 000 pixels 4. RS-232 control visual presenter technical specificationNew High Pixels Visual Presenter22X optical zoom ,8X digital zoomModel ... ,Brightness adjustment,Image freeze,Mirror,Colorful/ Black and White,Divide Screen,Text / Image Mode,Positive/ Negative,Brightness ... ,Brightness adjustment,Image freeze,Mirror,Colorful/ Black and White,Divide Screen(image split)Text / Image Mode, Lighting ...