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Under the interface of sleep mode, press "M" to enter the time setup of sleep mode, set
up the time length of sleep using "+" and "-", after setup, press "M" to confirm and exist.
Time length can be set between 0-180sec. After finishing setup, when time reaches the
time length preset, it will power off automatically. If set it up as 0s, the unit will close
this function
4.4 Contrast adjustment
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