Respironics PR System One DS550 REMstar Auto CPAP with A-Flex and Heated Humidifier
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Respironics PR System One DS550 REMstar Auto CPAP with A-Flex and Heated Humidifier

Model: DS550HS, DS550S
For Reference Only

Respironics PR System One DS550 REMstar Auto CPAP with A-Flex and Heated Humidifier


This product is discontinued. See the latest model of the REMstar Auto CPAP .

Respironics' System One approaches the sleep management process with unmatched intelligence. A host of features deliver unrivaled performance for your sleep therapy needs. System One incorporates A-Flex and SystemOne Humidity to match your breathing cycles while providing therapy based on your personal humidity settings. Furthermore, Dry Box technology provides all of the water protection you'll need.


Respironics has augmented traditional pressure therapy in order to improve comfort and raise compliance. The Digital Auto-Trak algorithm identifies the onset of inspiration and exhalation allowing it to deliver the right pressure relief every time. A-Flex synchronizes with Respironics' CPAP algorithm to maximize comfort by delivering optimal pressure during your entire breathing cycle. Respironics Pressure Profile mimics your breathing, allowing the device to effectively respond to your needs throughout your sleep session.

Resistance Control

System One resistance control works on establishing an optimal relationship between the device and the mask. The ending result is a synchronized pressure delivery guaranteeing the full benefits of Flex technology regardless of the mask.

Dry Box Technology

Dry Box technology guarantees that virtually all water is eliminated from seeping into the machine during normal use. The device can even be turned upside down or tilted without causing water to leak back into the device itself. You can rest easy knowing Dry Box provides the water protection you need to use your CPAP Machine.

System One Humidity

System One Humidity manages multiple factors including room humidity, room temperature, and flow to maintain your desired humidity settings. Even when the environment changes you can rest easy knowing that Respironics will optimize your therapy in any situation.

Advance Event Detection & Response

System One is able to automatically identify and adapt therapy levels in response to common OSA related events. Respironics has even designed System One to respond to symptoms that surpass classic OSA events, that could indicate a potential need for specialized therapy.

Key Features

  • A-Flex Technology - Synchronizes with Respironics algorithm to maximize comfort and deliver optimal pressure
  • Dry Box Technology - Prevents water from seeping into fragile electronic components
  • System One Humidity - Manages multiple factors including room humidity, temperature and flow for optimal humidity
  • Ramp Feature - Starts pressure at lower levels and gently increases to prescribed pressure over a 45min window in 5min increments
  • Automatic Altitude Adjustment - Automatically adapts pressure to varying altitude conditions
  • Heated Humidifier - Humidifier delivers warm air to reduce common CPAP therapy irritations such as nasal congestion, dry mouth, etc.

Reviewers Tip:

There are 3 distinct modes of operations on this device, which provide you the flexibility you need to find the best suited therapy for you.

This item is discontinued


What is the pressure range?

The pressure ranges from 4 to 20cm H20.

How much does the device weigh?

The device is fairly light, weighing approximately 4.8lbs.

What sort of filters does this device use?

Pollen and ultra fine.


Technical Data
DS550HS, DS550S
Item Includes
  • Respironics PR System one REMStar Auto CPAP Machine with A-Flex
  • System One humidifier
  • Travel Bag
  • User Manual
  • Performance Tubing
  • Power Adapter (100v-240v AC auto adaptive; world travel ready)
  • FREE filters for three years -- only from
  • Smart Card
Reviews (9)
Troy D(Verified Purchase) 10/09/2010
5 of 5 Stars!

I brought this machine from the Repshop and it works well and have had no problems .The main reason for writing this reveiw is for the great service that I recieved from the Repshop.They always return your emails promptly and help where they can. Thanks again Repshop for a great service . You will be the first place I will at shop when I require additional equipment.

Kind Regards


Sorin T(Verified Purchase) 06/06/2012
5 of 5 Stars!

When I bought the medical device Respironics REMstar Auto CPAP System One PR with A-Flex and heated Humidifier SKU: DS550HS, i never thought I could be so happy with the performance and features that it offers. Basically now I can not part with it. Thanks for promptness Respshop company completing the transaction and providing quality products.

MARTY D(Verified Purchase) 04/11/2012
5 of 5 Stars!

I picked the respironics as it is a great little performer easy to use very reliable and quiet. And the great service here at Resphop can not be surpassed, you order and you get at a great price. Unless it is the Aussie Resmed brand which can not be sent back to where it was made :)

MARTY D(Verified Purchase) 03/04/2011
5 of 5 Stars!

This machine is very well priced and has the features we all need. I was so happy with the service I recieved and the prompt delivery. Also the supply of filters is a great idea.........thnx again

Sylvio F(Verified Purchase) 10/23/2011
5 of 5 Stars!

I have used this machine for some time now and it's very easy to adapt to it, we don't even feel we are using the system, very quiet. With a good mask, it's a perfect pair.

James K(Verified Purchase) 09/28/2011
5 of 5 Stars!

I bought this machine from the Respshop and I have never slept better. My wife said it is very quiet. Thank you for a good product .

James L 06/14/2012
4 of 5 Stars!

This machine is good but it shows "service required" after one year use. I had to return it to for service.

Diana L(Verified Purchase) 11/02/2011
5 of 5 Stars!

Muy buen equipo. Estoy muy contento con la compra. Saludos desde Santiago de Chile.

valentina k 03/31/2012
5 of 5 Stars!

have you this aparat,how much kostet that you shipping in serbien-thank you

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Q&As (3)
Have a question on this item? Ask here and we will answer it in 12-24 hours, usually in a few business hours! Questions and answers will appear here after we answer. You may also have email notifications.
do you have any refurbished units
No I am sorry but we do have great prices on new machines.
Good afternoon

I am interested in acquiring your product, my question is if you can send me to Mexico and how much will it cost me.
Sorry this product is discontinued.
Estou indo p Nova York agirá em dezembro, quero comprar na loja um cpap c umidificador.
Favor passar os modelos e valores?
Hola, lamentablemente no tenemos una tienda en Nueva York. Estamos ubicados solo en el estado de Washington. Sin embargo, podemos enviarte un dispositivo sin ningún problema. Necesitaríamos una receta de un médico. Puedes ver nuestros dispositivos disponibles y sus precios aquí:
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