Quietness
S9’s enhanced Easy-Breathe motor eliminates noise, creating a quiet and peaceful environment for you and your bed partner. Intuitive Design
Sophisticated technology combines with novel user-friendly controls in a stylish new design that departs dramatically from its predecessors.
In a class of its own
Market research has shown that patients do not like the medical look of standard sleep apnea devices. With its sleek contours and compact size, the S9 looks as natural at your bedside as a clock radio.
Easy-to-use features

The user interface on the S9 Series is both simple and intuitive.
With four clearly marked buttons and a large, color display, adjusting settings has never been easier.
Simple menu functionality
An intuitive interface makes it a breeze to adjust settings and customize levels:
Turn push dial until the parameter you require is displayed in blue.
Press push dial. The selection is highlighted in orange.
Turn push dial until you see the setting that you require.
Press push dial to confirm your choice.
Enhanced AutoSet
The S9’s enhanced AutoSet algorithm now differentiates between obstructive and central sleep apneas (CSA) and responds appropriately. You can be confident that you're always receiving optimal therapy at the lowest, most comfortable pressure.
ResMed’s Enhanced AutoSet Algorithm
The S9 AutoSet combines an intelligent algorithm with Easy-Breathe expiratory pressure relief (EPR) to dynamically adjust pressure for maximum comfort. Using ResMed's time-tested APAP technology, AutoSet continually monitors breathing, adapting breath by breath to always deliver the lowest therapeutic pressure, improving comfort and sleep.
CSA detection
CSA detection is now available in both the S9 AutoSet and S9 Elite.
It uses the forced oscillation technique (FOT) to determine the state of the airway during an apnea. When an apnea is detected, small oscillations are added to the pressure to measure airway patency. The CSA algorithm uses the resulting flow and pressure to measure airway patency and differentiate central and obstructive events.
Exclusive to ResMed, the SlimLine small diameter air tube is the lightest tube available and eliminates tube drag.
RETURNS POLICY :
30 day return policy. Returns are subject to a 15% restock fee if the item is non defective. Customer is responsible for the return shipping cost. Items listed for parts or repair can not be returned. Returned Item must be in the Original Unaltered state! Return is VOID if any alterations, repairs, damages, etc have occurred. NO refund will be issued. All items returned must include everything sent, including all original boxes, packing, accessories, hardware, manuals, etc. Serial Numbers must be verified. NO refund will be issued until after return order is complete.
Performance
- Pressure range: 4 to 20 cm H2O (± 1 cm H2O increments).
- Pressure adjustment: 0.5 cm H2O.
- Ramp time: 0 to 45 min.± 1 min. (5-min. increments).
- Ramp start pressure: 4 to CPAP pressure.
- Minimum sound level: < 24 dba at 1 meter.
- Operating Altitude: Up to 8,500 ft (2,591 m).
Physical Characteristics
- Size: 3.4 H x 5.5 W x 6.0 D inches (8.6 x 14.0 x 15.3 cm).
- Weight: 1.8 lb (835 g).
Power Characteristics
- Power Supply: Input Range (auto-ranging): 100 - 240V, 50 - 60 Hz.
- Maximum Power Consumption: 50 W without Humidifier.
- Battery: ResMed Only RSM33942 DC Converter Cable must be used with any 12 Vdc power source. Note: the Humidifier will not heat when connected to a 12 VDC source.
- Inverter: Minimum 200 Watts will allow for the Heated Humidifier to operate. The inverter will reduce battery capacity by 30% or more due to inherent inefficiency.
Environmental Requirements
- Operating Temperature: +41°F to +95°F (+5°C to +35°C) , 10% to 95% relative humidity (RH), non-condensing.
- Operating Altitude: 0 to 9,000 ft (2,743 m).
- Operating Humidity: Between 10% and 95% noncondensing.
S9 AutoSet CPAP, SlimLine 6' 6" - 22mm Hose, 2 Disposable Air Filters, Carrying Bag, and Patient Manual.