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D1374201_User_Manual_T550_T770_MXP_CCM
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4.3 Audio Settings
Alert Tone
Different ringing tones may be selected.
Alert Volume
You may change the volume level for the selected ringing tone.
Key Tones
On
There will be a tone indicator when pressing keys on the remote control.
Off
There will be no tone when pressing keys on the remote control.