This option is desianed to give notice information including sound and message when users come with some problems. There are following notice options:High Pressure Reminder Sound: When the user upper airway pressure is over 3.5cmHz0 of the setting pressure, the PAP will beep with reminder message.Low MV Reminder Sound: The minute volume is lower than the setting value: the PAP will beep with reminder message. The range of the reminder value is 1 to 10lpm.Leak Reminder Sound: When this option is enabled. the PAP beeps with reminder message if the mask leaks too much air or if you remove the mask during the therapy.Outage Reminder Sound: When the power is stopped suddenly, the PAP will beep with reminder message.Asphyxiation Reminder Sound: When the time of user asphyxia is over the set value, the PAF will beep with reminder message. The range of the reminder value is 10 to 40 second.Low VT Reminder Sound: The tidal volume is lower than the settina value; the PAP will beep with reminder message. The range of the reminder value is 50 to 500ml.