4
Steadily on when the battery is fully charged.
Whole icon flashes when the battery is charging.
Flashes when low battery power level is
detected and the handset needs charging.
Steadily on when more characters are existed
before the text currently displayed.
Steadily on when more characters are existed
after the text currently displayed.
(MENU)
Press to select more menu options if applicable
Press to confirm the current selection if
applicable.
(INT)
Press to initial an intercom call when idle.
(BACK)
Press to go back to previous menu level or
cancel the current action if applicable.
Press to clear a character or stop the alarm if
applicable, press to mute / unmute during a call.
Steadily on when when you have received
missed calls.
Steadily on when the speakerphone is turned
on.