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navigate.
OK key
Press it to confirm your selection. In idle screen, long press OK key can turn on/off torch which situates
at the top of the phone.
Delete key
Press it to delete a character before cursor.
Linefeed
This key helps to switch to another line when the interface is in the edit interface.
Shift key
Press this key to switch between input methods.
Space key
Press it in the edit interface to get a blank. In idle interface, long press Space key can turn on/off torch
which situates at the top of the phone.
Sym key
Press it in the edit interface to input a symbol.
Caps key
Press it to switch between upper case and lower case.
Alt
In edit interface, press it to input an alternative symbol or number.
Number keys, letters
Press number keys or letter keys to in input or edit state to input numbers or letters;
