LG -G510 User Manual page 189

The voice memo feature you to record up to 3 voice messages and
each memo is up to 30 seconds. This is useful when you don't have
a pen and paper to hand for taking directions or a message.
Press [Memo Key] for a long time in a standby.
You can use this function only in standby mode.
Once recording is started, the message
remaining time will be displayed.
If you want to finish recording, press the
The phone shows voice memo information which includes the
recording time and date by pressing
You can delete all memos by selecting [Delete All] After you selected
the memo by using
menu You can play or delete the recorded voice memo.
You can play the selected voice memo in this menu.
You can delete the selected voice memo.
86
[Memo Key] for a short time.
and and press
and the
[Memo key] shortly.
, you can see this