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Rhythm P2-S4 Portable Oxygen Concentrator
The featherweight of the family — 3.3 lb, four settings, and a modular battery up to 7.2 hours. FAA-approved for flights.
From US$1,395 – US$1,795
Condition
NewFrom US$1,395 – US$1,795Open Box Price range: US$1,415.00 through US$1,995.00
✓ 3-yr device / 1-yr sieve / 1-yr battery · authorized Rhythm dealer
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Call (786) 755-8063FAA approvedFDA clearedAuthorized Rhythm dealerFree shipping $99+
4pulse settings (1–4)
840mL/min max output
3.3 lbsingle battery
up to 7.2 htriple battery, setting 1
4pulse settings (1–4)
840mL/min max output
3.3 lbsingle battery
up to 7.2 htriple battery, setting 1
- 4 pulse settings (1–4) · up to 840 mL/min · 3.3 lb single
- Modular battery: single, double, or triple — up to 7.2 h on setting 1
- FAA-approved for flights · FDA-cleared (prescription required)
- Authorized Rhythm dealer · new unit · 3-yr device warranty
FAA approvedFDA clearedAuthorized Rhythm dealerFree shipping $99+
THE FEATHERWEIGHT THAT GROWS WITH YOU · AUTHORIZED RHYTHM DEALER
One light body, three battery lives
The Rhythm P2-S4 is the featherweight of the family — just 3.3 lb with the single battery, so it disappears on your shoulder. Its clever trick is the modular battery: keep it light for a quick errand, or click on the double or triple pack for up to 7.2 hours of oxygen on a full travel day. Four pulse settings cover the most common low-to-mid prescriptions.
American Oxygen is an authorized Rhythm Healthcare dealer. Every P2-S4 is a new, genuine unit — FDA-cleared and FAA-approved — backed by the full Rhythm manufacturer warranty.Why the Rhythm P2-S4
3.3 lb — the lightest way to carry oxygen
With the single battery the P2-S4 weighs just 3.3 lb. It's the featherweight of the P2 line, built for people who found other portables too heavy to actually take out the door.
Modular battery: 3 sizes, one unit
Snap on the single, double, or triple battery depending on your day. Single for a light errand, triple for a full travel day — up to 7.2 hours on setting 1 without a wall outlet.
FAA-approved & FDA-cleared
The P2-S4 is FAA-approved for commercial flights, so it flies in the cabin with you. It's a genuine, FDA-cleared prescription medical device — not a grey-market import.
Where the P2-S4 sits in the family
Your prescribed flow setting decides the model. The S4 is the light end — four settings in the lightest body Rhythm makes.
Rhythm S4Rest of the P2 family
1–31–41–51–61–7
Bars show each model's top pulse setting. Need more settings or continuous flow? Step up to the P2, E-series, or the transportable TOC3. Pulse-dose output is not equivalent to continuous-flow LPM.
Battery runtime — single vs double vs triple
The same P2-S4 runs longer as you add battery capacity. Here's how each pack performs across the four settings (hours per charge).
Runtime is approximate and varies with your breath rate, battery age, and temperature. The single battery ships standard; the double and triple are available from American Oxygen.
Runtime by setting — exact hours
Oxygen output rises with each setting, and battery time comes down. Match your prescribed setting to the battery that fits your day.
| Pulse setting | O₂ output | Single | Double | Triple |
|---|---|---|---|---|
| Setting 1 | 210 mL/min | 2h 30m | 4h 48m | 7h 12m |
| Setting 2 | 420 mL/min | 1h 42m | 3h 30m | 5h 00m |
| Setting 3 | 630 mL/min | 1h 12m | 2h 30m | 3h 30m |
| Setting 4 | 840 mL/min | 1h 00m | 2h 00m | 3h 00m |
| Recharge — single battery | up to 2 hours (AC) |
| Recharge — double battery | up to 4 hours (AC) |
| Recharge — triple battery | up to 6 hours (AC) |
The P2-S4 holds a fixed minute-volume per setting: the bolus per breath adjusts to your breath rate to keep oxygen output steady — 210, 420, 630, and 840 mL/min at settings 1 through 4.
Which Rhythm is right for you?
The S4 is the light, modular option. Step up to the P2 for a fifth setting and more output, or the S3 for the simplest, lowest-cost entry.
| P2-S3 | P2-S4 | Rhythm P2 | |
|---|---|---|---|
| Pulse settings | 1–3 | 1–4 | 1–5 |
| Max oxygen output | — | 840 mL/min | 1,000 mL/min |
| Weight (single battery) | 3.3 lb | 3.3 lb | 4.37 lb |
| Battery options | Single–Triple | Single–Triple | Single |
| Longest runtime | up to 7.2 h (triple) | up to 7.2 h (triple) | up to 5 h |
| FAA / FDA | Yes / Yes | Yes / Yes | Yes / Yes |
Details
What is the Rhythm P2-S4?
The Rhythm P2-S4 is a compact, ultralight pulse dose portable oxygen concentrator with four flow settings (1–4) and a modular battery that scales from 3.3 lb up to a full-travel-day triple pack. It's built for oxygen users who want the lightest possible unit for errands, appointments, and travel.
It is designed for users prescribed pulse dose oxygen therapy. It is not a continuous-flow concentrator — if you require continuous oxygen, look at the Rhythm TOC3 or confirm alternatives with your clinician.
Who it's for
- Active oxygen users at settings 1–4 who want the lightest unit they can carry all day.
- Travelers — FAA-approved for flights; add the triple battery for long days away from an outlet.
- Caregivers looking for a genuine, supported unit with a real manufacturer warranty.
Pulse dose only. Confirm your prescription and required setting with your clinician.
Technical specifications
| Oxygen delivery | Pulse dose, settings 1–4 |
| Oxygen output | 210 / 420 / 630 / 840 mL/min (settings 1–4) |
| Oxygen concentration | 87% – 96% (90% −3%/+6%) |
| Weight | 3.3 lb single · 4.0 lb double · 4.4 lb triple (with battery) |
| Dimensions | 6.2" D × 3.4" W × 6.7" H (single battery) |
| Battery options | Single 3,400 mAh · Double 6,800 mAh · Triple 10,200 mAh (14.4V) |
| Battery runtime | up to 7.2 hours on setting 1 (triple) |
| Recharge time | 2 h single · 4 h double · 6 h triple (AC) |
| Noise level | 40 dB(A) at setting 2 |
| Display | 2" color LCD |
| Warm-up time | 2 minutes |
| Power | AC 100–240V (worldwide) + DC 11–16V car charger |
| Delivery type | Pulse dose (not continuous flow) |
| Certifications | FAA-approved for flights · FDA-cleared (prescription required) |
* Battery cell counts and exact metric figures follow the Rhythm P2-S4 platform; confirm details for your unit with our team.
Accessories & replacement parts
Genuine Rhythm parts keep your P2-S4 running for years — all available from American Oxygen:
- Double & triple batteries (S3BY001D / S3BY001T) — extend your runtime for travel days.
- Intake filters — the included set gets you started; replacements available.
- AC wall supply & DC car charger — replacements and spares.
- Carry bag & cannulas — genuine accessories.
What's included
Rhythm P2-S4 concentrator, rechargeable battery, AC wall power supply, DC car charger, carry bag, nasal cannula, accessory bag, and user manual. Sold by American Oxygen in Doral (Miami), FL with nationwide U.S. shipping and warranty support.
Why buy from American Oxygen
- Authorized Rhythm dealer — genuine, new units only, no gray-market imports.
- Full Rhythm warranty: 3 years on the device, 1 year on sieve columns, 1 year on the battery.
- Genuine parts & sieve columns available so your unit keeps running for years.
- Doral (Miami) pickup or fast nationwide shipping, free over $99.
Frequently asked questions
How long does the P2-S4 battery last?
Up to 2.5 hours on the single battery at setting 1, up to 4.8 hours on the double, and up to 7.2 hours on the triple. Higher settings use more oxygen and shorten runtime. Many customers carry a charged spare for long days.
Is the P2-S4 approved for airline travel?
Yes. The P2-S4 is FAA-approved for use on commercial flights and travels in the cabin with you. Airlines typically ask for advance notice and enough charged batteries for about 150% of your flight time.
Do I need a prescription to buy it?
Yes. The P2-S4 is an FDA-cleared prescription medical device. American Oxygen can help you understand what's needed — just ask when you call.
How is the S4 different from the S3 or the P2?
The S3 has three settings, the S4 has four, and the P2 has five with higher output. All three share the same light body; the S4 is the middle of the light trio — more oxygen headroom than the S3, lighter than the P2.
Is this a new unit with warranty?
Yes. American Oxygen is an authorized Rhythm dealer. Every P2-S4 is new and genuine, backed by the Rhythm manufacturer warranty — 3 years device, 1 year sieve columns, 1 year battery — plus our local support.
Not sure the S4 is your setting? We'll help you choose.
Tell us your prescribed flow setting and we'll match you to the right Rhythm — just call.
Call (786) 755-8063| Dimensions | 15 × 13 × 11 in |
|---|---|
| Condition | |
| Pulse settings | 4 |
| Warranty | |
| Operating Mode | |
| Battery Option |
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