User Manual for Commercial Series Net DVRPage 44 Total 1215.2 Main and Aux output previewYou can use “Main” output to enter into DVR menu, setup both “Main” and “Aux” outputpreview properties.Please press 【Main/Aux】 button to enter into “Main” output control mode, then press【Menu】 button to enter into DVR menu, the main video output will display the following DVRmenu:Move “Active Frame” to “Preview” icon and press【ENTER】to enter into “Preview” menu:You can select out to setup main output and aux output respectively.