Inogen One G4 Portable Oxygen Concentrator w/ Single Battery


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Inogen G4 Manual
Inogen (Model: IS-404)
Price: $2,495.00
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The Inogen One G4 is the most lightweight portable concentrator going up to 3 LPM pulse dose. This sleek, yet efficient concentrator weighs only 2.8 lbs.

Total: $

Key Specs

Weight Liters Per Minute Sound Level Length Width Height Warranty
Weight 2.8 lbs Liters Per Minute 1-3 LPM Sound Level 40 dB Length 5.91" Width 2.68" Height 7.2" Warranty 3 Year Limited



The Inogen One G4 Portable Oxygen Concentrator is the smallest portable oxygen machine from the popular brand, Inogen. The G4 Oxygen Concentrator is able to provide you with oxygen from an incredibly quiet & small package. With oxygen flow settings from 1-3, the Inogen One G4 is capable of increasing your independence & freedom day & night.

Inogen One G4 Portable Oxygen Concentrator

The Inogen One G4 Oxygen Concentrator features Inogen's Intelligent Delivery Technology, which is what sets it apart from competitors. The Inogen One portable oxygen system ensures that oxygen is delivered within the first 400 milliseconds of breathing in, which is when oxygen has the most effect on lung gas exchange. The Inogen One G4 utilizes innovative triggering sensitivity to quickly detect a breath and deliver oxygen within this critical period. Less sensitive oxygen concentrators may create lags in the onset of the bolus, resulting in portions of the delivered bolus arriving too late, which has less effect on lung gas exchange.

Inogen One G4 Portable Oxygen Concentrator

Inogen One G4's Intelligent Delivery Technology also accurately detects your breathing rate and adjusts the oxygen level provided accordingly. If you’re exercising or physically active, the unit will provide smaller, quick bursts to provide you with the right amount of oxygen. However, while resting or sleeping, the system provides slower & larger amounts of oxygen to correspond with your decreased rate of breathing. This means the G4 can be effectively used during sleep at night, an area where many other portable oxygen concentrators fall short. With the G4, you won’t need to use any other oxygen system for your respiratory care needs, whether it be during day or night.


Weight 2.8 lbs
Dimensions 5.91" x 2.68" x 7.2" (Height Includes Single Battery)
Oxygen Flow Intelligent Delivery Technology
Three Flow Settings From 1-3
Power Settings AC Power Supply 100-240 V, 50-60 Hz
(Auto Sensing to Allow Worldwide Use)
DC Power: for mobile use in car/airplane
Battery Duration (Single Battery): Up to 2.7 Hours
Duration (Double Battery): Up to 5 hours
Noise Level 40 dBA on Setting 2
Warranty Concentrator: 3 Years
Concentrator Sieve Beds and Accessories: 1 Year
See Limited Warranty Statement for Details.
Use Designed for Stationary, Portable, and Travel

Return Policy

We want you to be completely satisfied with your purchase. You may return your purchase within 30 days of receipt - see below for exceptions. To qualify for a return, please note the following:

  • Product must be unused, clean and not damaged
  • Original packaging and materials intact (i.e. instructions, warranty information)
  • Return shipping costs are the responsibility of the customer

Restocking Fees

A 15% restocking fees applies to all returns.

No Returns

There are no returns on the following categories of products:

  • Custom equipment
  • Ultralightweight wheelchairs
  • Sport wheelchairs
  • Handcycles
  • Lift Chairs with custom fabrics and/or heat and massage
  • Bath safety equipment
  • Mattresses
  • Wound care
  • Incontinence
  • Masks
  • Braces
  • Stockings
  • Batteries
  • Orthopedic supplies

Return Process

To return a product, the above conditions must be met. We require that all returns follow these instructions for proper processing:

  1. Call or email to request Return Authorization Number (RA)
  2. Warehouse must receive item within 15 days of an RA# being issued
  3. Report via phone or email a tracking number to customer service
  4. Items sent without an RA number cannot be credited
  5. The buyer is responsible for return postage costs


All credits will be given after receipt and warehouse inspection approval.

Inspect Your Product When It Arrives

Damaged or Defective Products: Please inspect your package when it arrives. If it is defective, damaged or short an item please notify us within 3 business days of delivery. Customer Service toll-free 888-982-8889. If you receive a damaged product we will replace any damaged or defective parts or replace the product at manufacturer's discretion.

Our service area covers most of Southern California including Los Angeles and surrounding cities.
To see a full list of cities covered in our service area please .