IOGear GBHFK331 - Manual (Page 21)

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Removing Phonebook Entries
During standby mode, hold on to both “+” and “-” buttons for 3 seconds
(“Phonebook Deleted” is announced) and the entire phonebook memory in the
speakerphone will be deleted.
Turning On/Off the Text-To-Speech Function
To toggle the TTS function On or Off, simply hold the “+” for 6 seconds in stand-
by mode (“Voice Prompt On” or “Voice Prompt Off” is announced to denote its
current status).