ResMed's S9 Series CPAP systems use an external power supply with AC Power Cord. This 90W version is supplied as standard with the CPAP system. The power supply is designed for universal inputs of 100–240V, 50–60Hz.
The S9 90W Power Supply measures: 6.5 x 2.5 x 1.5 inches.
ResMed Part # 36821