VTech VT1010 User Manual page 11

Indicate when the battery is fully charged.
Flash when the unit performs initial charging.
Indicate when the battery needs charging.
Flash when low battery power level is detected.
Indicate when more characters are existed before the text currently displayed.
Indicate when more characters are existed after the text currently displayed.
Press to select more menu options if applicable
(MENU)
Press to confirm the current selection if applicable.
Press to conduct Intercom call when idle
(INT)
Press to go back to previous menu level or cancel the current action if applicable
(BACK)
Press to clear a character or stop the alarm if applicable, press to mute / unmute during a call.
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