To power off your device, press the power button on the back of the monitor and hold for 3 seconds until you see a “Shutting Down” alert. The S4 monitor will automatically turn off after 5 minutes of inactivity.
You can also put your touchscreen to sleep by pressing the power button once lightly. Note that the S4 monitor will not automatically turn off if you put your touchscreen to sleep - you’ll need to manually power the S4 monitor off.