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The S9 30W power supply is a small, lightweight power supply suitable for any S9 device that isn't being used with an H5i Heated Humidifier.
The S9 90W power supply can be used to connect any S9 therapy device running with an H5i Heated Humidifier to the mains electricity supply.
The DC/DC converter 24V/90W output can be used to run a S9 device from a 12V or 24V DC power source, such as a car or boat battery.