LG G7100 User Manual page 19

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You can delete the characters, go back the menu.
In addition, you can view voice memo list when you
press this key shortly in a standby mode. If you
press a key for a long time, you can record the
voice.
If you press this key for a long time, you can activate
voice recognition.
On closing a flip, when you press this key sequently,
time, date, my display, and greeting note is
displayed respectively. If you press this key once,
time is displayed. It will show up depending on
setting "Show time".
This key is used to take a picture and save it.