LG G5200 User Manual page 131

Used to end or reject a call. This key is also used as
Power Key by pressing this key for a few seconds.
You can delete the characters, go back the menu
or deactivate the function. If you press in a
standby mode, you can use Voice memo function.
You can control the volume of key tone in standby
mode and also control the volume during a call.
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