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The Oxygen & Sleep Series
Portable oxygen concentrators, engineered — not prescribed.
Portable oxygen and sleep systems built to the tolerances of a chronograph and the silence of a reading room. No insurance paperwork, no waiting rooms — just air, done properly.
Caire
Caire FreeStyle Comfort
- Weight
- 5 lbs (with battery)
- Dimensions
- 10" x 7.3" x 3.1"
- Flow Settings
- 1-5 Pulse Dose
- Battery Life
- 8-16 hours
FAA Approved · Prescription Required
01 — Oxygen Therapy
5 lbs. 8 hours of battery. Zero hiss.
Molecular sieve concentrators built on the same PSA technology used in commercial aircraft — quiet enough for a boardroom, light enough to forget you’re wearing it.
View Concentrators02 — Sleep Apnea
The quietest breath you’ll never remember taking.
CPAP and BiPAP systems tuned for sub-27 dB operation and auto-titrating pressure — the machine adjusts to you, not the other way round.
View CPAP & BiPAPFDA-Registered
Every device on file
48-Hour Delivery
Continental US
Unmarked Packaging
Complete discretion
3-Year Concierge
One line, one person
The Inogen Lineup
Rove 4, Rove 6, and Voxi 5 — the three we recommend first.
The lightest portable for daily errands, the higher-output portable for active travel, and a home concentrator built for continuous overnight use — all from the manufacturer we sell the most of.
Built for scrutiny
The numbers we’d want to see, before buying
FAA travel-approved
100% of oxygen line
Every concentrator we sell is cleared for in-flight use — check the model plate, not the fine print.
SOUND
Quieter than a library, at arm's length.
WEIGHT
Lighter than a laptop.
BATTERY
A full transatlantic flight, unplugged.
ALTITUDE
Rated cabin-pressure ceiling.
What we actually deliver
Two atoms. That’s the entire product.
Every concentrator on this site does one job: pull ambient air through a molecular sieve and hand you back O₂ at 87–96% purity. No proprietary chemistry, no trade secret — just diatomic oxygen, delivered quietly and on schedule.
Read the mechanism in full in how oxygen concentrators work.
What actually filters it
A mineral with the right-sized holes.
Zeolite — a crystal whose lattice structure adsorbs nitrogen molecules under pressure while letting the smaller oxygen molecule pass straight through. No chemical reaction, no consumable filter to replace on a schedule — just physics, run in reverse every few seconds as the twin beds swap.
It’s also the one part that ages. Read what that means for upkeep in sieve bed maintenance and lifespan.
How progress gets measured
Two colors of light, one number.
A pulse oximeter shines red and infrared light through a fingertip and reads how much of each gets absorbed — oxygenated blood and deoxygenated blood absorb the two wavelengths differently, and the ratio, measured fresh with every heartbeat, is what becomes the SpO2 number on the display.
Where that number is accurate and where it isn’t, in how pulse oximeters actually work.
What “FAA-approved” certifies
Rated for a pressurized cabin, not sea level.
Aircraft cabins are pressurized to roughly 6,000–8,000 feet of equivalent altitude, not ground level — an FAA-approved concentrator is certified to keep delivering rated output at that altitude, the same way a cockpit altimeter is built to read accurately under thinner air, not just on the runway.
What to actually check before flying, in air travel oxygen requirements.
Flagship — Caire
Caire FreeStyle Comfort
- Brand
- Caire
- FAA travel status
- Approved
- Condition
- New
Prescription required by law for this device class. Upload or e-verify in under two minutes at checkout — we handle the rest.
We don’t bill insurance. On purpose.
No prior authorization queues. No claim denials three weeks after delivery. You see one price, you pay it, your equipment ships. That trade — simplicity for the paperwork — is the whole idea.
Speed
Orders ship in 48 hours — insurance authorization alone often takes longer than that.
Privacy
No claim is filed, which means no record with your carrier of what you purchased or why.
Clarity
The price on the page is the price at checkout. No adjudication, no surprise balance later.
Insurance policy:Currently we don’t accept Insurance, Medicaid, or Medicare. All orders are self-pay. This is stated here, at checkout, and in our FAQ — no exceptions, no fine print.
CIRRUS at a glance
Figures drawn from the live catalog
169
Devices & accessories in catalog
30
Manufacturers, authorized channels only
935
US cities with confirmed 48-hr delivery
451
Journal articles, sourced and cited
For Clinical & Institutional Buyers
Ventilators, sourced the same way — authorized channels, direct concierge support.
ICU, transport, and MRI-compatible mechanical ventilators from five manufacturers, for biomed and procurement teams, not individual patients. Different buyer, same standard.
Hamilton MedicalDrägerGetingeMindrayZoll
Areas Served
48-hour shipping to 935 cities. No branch office in any of them.
We’re a direct-ship retailer, not a chain of local storefronts — every order gets the same authorized inventory, prescription verification, and concierge line, wherever it’s going.
Journal — 04.2026