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Rhythm P2-S3 Portable Oxygen Concentrator
The lightest way to carry oxygen — three settings, modular battery up to 7.2 hours, FAA-compliant for flights.
From US$995 – US$1,595
Free shipping in the continental U.S.
Included in the price. No surprises at checkout.
Included in the price. No surprises at checkout.
✓ 3-yr device / 1-yr sieve / 1-yr battery · authorized Rhythm dealer
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Call (786) 755-8063FAA compliantFDA clearedAuthorized Rhythm dealerFree shipping $99+
3pulse settings (1–3)
3.3 lblightest single battery
up to 7.2 htriple battery, setting 1
87–96%oxygen concentration
3pulse settings (1–3)
3.3 lblightest single battery
up to 7.2 htriple battery, setting 1
87–96%oxygen concentration
- 3 pulse settings (1–3) · the lightest Rhythm at 3.3 lb
- Modular battery: single, double, or triple — up to 7.2 h on setting 1
- FAA-compliant for flights · FDA-cleared (prescription required)
- Authorized Rhythm dealer · new unit · 3-yr device warranty
FAA compliantFDA clearedAuthorized Rhythm dealerFree shipping $99+
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VISAAMEXDISC●VER
THE SIMPLEST WAY INTO PORTABLE OXYGEN · AUTHORIZED RHYTHM DEALER
Light, simple, and priced to start
The Rhythm P2-S3 is the easiest entry into portable oxygen — just 3.3 lb with the single battery and three clear pulse settings, nothing to overthink. Its modular battery is the clever part: 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 day out. It's the lowest-cost way into the P2 family.
American Oxygen is an authorized Rhythm Healthcare dealer. Every P2-S3 is a new, genuine unit — FDA-cleared and FAA-compliant — backed by the full Rhythm manufacturer warranty.Why the Rhythm P2-S3
3.3 lb — genuinely easy to carry
With the single battery the P2-S3 weighs just 3.3 lb. It's built for people who found other portables too heavy to actually take out the door — light enough to sling on a shoulder and forget.
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 day out — up to 7.2 hours on setting 1 without a wall outlet.
FAA-compliant & FDA-cleared
The P2-S3 is FAA-compliant 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-S3 sits in the family
Your prescribed flow setting decides the model. The S3 is the entry point — three settings in the lightest body Rhythm makes.
Rhythm S3Rest 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 S4, 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-S3 runs longer as you add battery capacity. Here's how each pack performs across the three 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 |
| 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-S3 holds a fixed minute-volume per setting: the bolus per breath adjusts to your breath rate to keep oxygen output steady — 210, 420, and 630 mL/min at settings 1 through 3.
Which Rhythm is right for you?
The S3 is the simplest, lowest-cost way in. Step up to the S4 for a fourth setting, or the P2 for a fifth setting and higher output.
| Rhythm P2-S3 | P2-S4 | Rhythm P2 | |
|---|---|---|---|
| Pulse settings | 1–3 | 1–4 | 1–5 |
| Max oxygen output | 630 mL/min | 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-S3?
The Rhythm P2-S3 is a compact, ultralight pulse dose portable oxygen concentrator with three flow settings (1–3) and a modular battery that scales from 3.3 lb up to a full-day triple pack. It's the simplest, lowest-cost way into portable oxygen.
It is designed for users prescribed pulse dose oxygen therapy at lower settings. 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
- New oxygen users at settings 1–3 who want the lightest, simplest unit to start with.
- Travelers — FAA-compliant for flights; add the triple battery for long days away from an outlet.
- Budget-conscious buyers who want a genuine, warrantied unit at the lowest entry price.
Pulse dose only. Confirm your prescription and required setting with your clinician.
Technical specifications
| Oxygen delivery | Pulse dose, settings 1–3 |
| Oxygen output | 210 / 420 / 630 mL/min (settings 1–3) |
| 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 | under 45 dB(A) at setting 3 |
| 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-compliant for flights · FDA-cleared (K230702, prescription required) |
* Battery cell counts and exact metric figures follow the Rhythm P2-S3 platform; confirm details for your unit with our team.
Accessories & replacement parts
Genuine Rhythm parts keep your P2-S3 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-S3 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-S3 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-S3 approved for airline travel?
Yes. The P2-S3 is FAA-compliant 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-S3 is an FDA-cleared prescription medical device. American Oxygen can help you understand what's needed — just ask when you call.
How is the S3 different from the S4 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 3.3 lb body and modular battery; the S3 is the simplest and lowest-cost of the three.
Is this a new unit with warranty?
Yes. American Oxygen is an authorized Rhythm dealer. Every P2-S3 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 S3 is enough for 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
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