4.1.9 Digital zoomIn Full screen mode, you can enter the Digital Zoom mode with this button.When using digital zoom in Split screen mode, this feature will default to channel 1, unless you selecta different camera image.[Zoom mode of 4 / 8 / 16channels][Zoom mode of 32channels] : Move Zoom area with arrow buttons. : Zoom ratio will be changed from 1x to x517