VIEWSONIC XG320U 32" 16:9 144 Hz FreeSync IPS Gaming Monitor - Manual (Page 25)

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Turning the Device On/Off
1. Plug the connected power cord into a power outlet.
2. Press the Power button to turn on the monitor.
3. To turn the monitor off, press the Power button again.
NOTE: The monitor will still consume some power as long as the power cord
is connected to the power outlet. If the monitor is not being used for a
long period of time, please disconnect the power plug from the power
outlet.