ResMed's S9 Series CPAP systems use an external power supply with AC Power Cord. There are two versions of the power supply: a 90W version which is supplied as standard with the system, and a 30W version available as an optional accessory (for use without humidifier).
The 30 Watt Power Supply includes four plug adapters, including adapters for US, Europe, Australia and Great Britain.
The 30 Watt power supply offers less bulk (it's 2.5 inches shorter than the 90W power supply) and less weight (it's about 3/4 the weight of the 90W power supply). It's a great choice for CPAP users traveling without a humidifier.
When using this power supply with a humidified machine the heater plate and tubing need to be turned off so that the unit is working in passover humidifier mode only. Please note that this 30W power supply is not designed to power a ResMed S9 machine with a humidifier. If you're using the S9 H5i heated humidifier, then you need the 90W transformer which came with your device.
Also note that this 30W transformer works with all S9 devices, including the S9 VPAP bilevel devices.
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This is the third time I have purchased something from the CPAP Clinic and their service and prices are EXCELLENT. Delivery is fast and they actually answer their emails promptly. :-) They have free stuff occasionally which is nice.
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