Rhythm P2-S4 Portable Oxygen Concentrator OPEN BOX - Image 2

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Rhythm P2-S4 Portable Oxygen Concentrator OPEN BOX

4 pulse settings (1–4) · up to 840 mL/min · 3.3 lb single

From US$1,415 – US$1,995

Condition

New Open BoxFrom US$1,415 – US$1,995

✓ Genuine, unused unit with the full Rhythm factory warranty — 3-yr device · 1-yr sieve columns · 1-yr battery.

Battery Option

Clear

Call (786) 755-8063

Open Box · like-newFAA 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

Open Box — brand-new, never used. Box opened for display only; you save versus sealed stock.
4 pulse settings, up to 840 mL/min and a modular single/double/triple battery from just 3.3 lb — genuine, current-generation Rhythm P2-S4.
FAA-approved for cabin use and FDA-cleared prescription device.
Full Rhythm factory warranty · authorized dealer · free U.S. shipping over $99.

Open Box · like-newFAA approvedFDA clearedAuthorized Rhythm dealerFree shipping $99+

Secure checkout · financing available

VISAAMEXDISC●VERaffirm

Brand: Rhythm Healthcare
SKU: P2-S4-OB
Category: Portable Oxygen Concentrator

OPEN BOX · LIKE-NEW, LOWER PRICE

A brand-new Rhythm P2-S4, at an Open Box price

This Rhythm P2-S4 is Open Box — brand-new and never used. The box was opened only for photos or display, then sealed and set aside, so you get a genuine, current-generation unit with 4 pulse settings, up to 840 mL/min and a modular single/double/triple battery from just 3.3 lb at a lower price than sealed stock — and the same full Rhythm factory warranty.

Genuine unused unit · full factory warranty · prescription device · free U.S. shipping $99+ · call (786) 755-8063 to confirm availability.

Why this concentrator

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.

Battery runtime by setting

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)

Per-setting runtimes are American Oxygen estimates; actual battery life varies with breath rate, altitude and battery age.

Details

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)

Warranty & condition

Genuine, unused unit with the full Rhythm factory warranty — 3-yr device · 1-yr sieve columns · 1-yr battery.

In short

The Open Box Rhythm P2-S4 is a brand-new, never-used Rhythm P2-S4 — the box was opened only for display — offered below sealed-stock price. It's a genuine, FDA-cleared, FAA-approved portable oxygen concentrator with 4 pulse settings, up to 840 mL/min and a modular single/double/triple battery from just 3.3 lb, sold by American Oxygen (an authorized Rhythm dealer) with the full Rhythm factory warranty and free U.S. shipping over $99.

Frequently asked questions

What does “Open Box” mean for the Rhythm P2-S4?

An Open Box Rhythm P2-S4 is a brand-new, unused unit — the sealed box was opened only for photos or display and then set aside. It has never been used on a patient, it's genuine and current-generation, and it carries the full Rhythm factory warranty. You simply pay less than for sealed stock.

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, and every Open Box Rhythm P2-S4 is genuine and unused, backed by the full Rhythm manufacturer warranty — 3 years device, 1 year sieve columns, 1 year battery — plus our local support.

Not sure Open Box is right for you? We'll walk you through it.

An Open Box Rhythm P2-S4 is a genuine new unit at a better price — same warranty, same performance. Call American Oxygen at (786) 755-8063 or message us to confirm current availability and get help choosing the right settings for your prescription.

Call (786) 755-8063

Dimensions	15 × 13 × 11 in
Condition	Open Box
Pulse settings	4
Warranty	3-years
Operating Mode	Pulse Dose
Battery Option	3 Battery Pack, Double Battery, Standard Battery, Triple Battery