Speco Technologies SIPT5 - Manual (Page 56)

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Shutter status and speed control
You can control brightness of the screen by the shutter speed.
a. Press the SET button to display the setup menu and move the
arrow indicator to ‘SHUTTER’ using the UP or DOWN
button.
b. Set ‘SHUTTER’ the desired mode using the LEFT or RIGHT
button.
OFF : Deactivation
FLK(1/100) : Flicker mode
(When WDR is on, the image can flicker a little)