Autel Maxivideo MV400 - Manual (Page 23)

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A brightness indicator bar will be displayed on the screen as you
adjust brightness. (Fig. 12)
Fig. 12
5) Zooming
Simply press UP and DOWN arrow buttons while in the still camera
mode to zoom in or out. A zoom indicator bar will be displayed on
the screen as you adjust zoom. (Fig. 13)
Fig. 13
6) Entering the Primary Settings Screen
Pressing Setting button while in the live screen will take you to the
primary settings screen. (Fig. 14) Pressing Back button at any point
will take you back to the live screen.