Usage Information: This Universal Power Supply will automatically adapt to voltages in most countries worldwide. (A plug adapter may be required for use outside of North America.) It is sugguested to only use this power supply with AirCurve 11 sleep therapy devices. You may use the ResMed AirSense 11 65 Watt AC Power Supply with this machine but there may be some degradation to the humidifier performance when mouth or mask leak is present. Using a non-ResMed power supply with a ResMed CPAP or BiLevel machine may damage it and void the manufacturer's warranty. For complete instructions review the documentation that came with your equipment.