3.2 Screen of opening and closing
It will be closed during the screen idling.
After idling period of time, screen will be automatically
closed to save the battery.
When the screen is on, you can press the power button to
shut down the screen immediately.
Opening in screen closed condition.
When the screen is off, you can long press Power On/Off
button to activate it. Enter locked condition after opening it,
press "lock "icon and slide up for unlocking, and holding up
"voice " icon and slide down for mute condition.
User Guide 13