Aposonic A-S1604R20A - Manual (Page 36)

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5.7 System Shutdown (Administrator)
In Menu display, press ▲▼◄► to change the highlighted option to Shutdown, and
then press ENTER
(Mouse: Left click) to shutdown the system. A confirmation
dialog will be shown on the screen, press ENTER to confirm the shutdown. The
system will save all the files and all the states, and then display a power-off message
in the rolling screen message area. The user may power off the system safely when
the power-off message is shown.