It includes following functions.- View up to 16 cameras at one location.- Monitor multiple locations from one app.- View in portrait or landscape mode.- Max. 4 channels can be selected to display split screen.- Single or split screen display. (To change from split screen to full screen, just tap the display twice. Single tapping the display again returns to split screen.)- PTZ support.MD Viewer supported DVR list:MDR-x500 Series,MDR-H0000A Series