Speco Technologies CVC-6246IHR - Manual (Page 17)

① Press the SET button to display the setup menu and move the arrow
indicator to ‘SHUTTER’ using the UP or DOWN button.
② Set ‘SHUTTER’ to the desired mode using the LEFT or RIGHT button.
▶ OFF : Deactivation
▶ FLK(1/100) : Flicker mode
2) Shutter status and speed control
You can control brightness of the screen by the shutter speed.
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