Samsung SEC-R311ZGAUSC - Manual (Page 76)

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The following options appear in the display:
• Tone Level
• Tone Length
2. Select the desired option.
• If you select Tone Level:
– To set the keypad Tone Level, use the Volume key or Navigation key.
– To save your Tone Level setting, press . You are returned to the Key
Tone sub-menu.
• If you select Tone Length:
– Select Short or Long. You are returned to the Key Tone sub menu.