About 5lo2 — Your Trusted Portable Medical Oxygen Care Partner

5lo2 is a technology company specializing in the research, development, production, and sales of portable medical oxygen concentrators. Leveraging medical-grade technology and user-friendly design, we provide breathing freedom solutions for patients with respiratory diseases, high-altitude travelers, and those recovering from surgery. Our core product, the 5L adjustable oxygen therapy machine, leverages lightweight design, intelligent technology, and long battery life to break the limitations of traditional oxygen devices.

Our Mission

5lo2 doesn’t just sell oxygen concentrators; we’re dedicated to redefining freedom for everyone who needs continuous oxygen. Traditional oxygen concentrators have long been bulky, restrictive, and unstable, hindering users’ ability to live comfortably or fully enjoy life. To change all this, we designed and developed the 5L pulse oxygen concentrator, allowing you to focus on what matters: family, travel, everyday moments, and a life without constraints.

Our Core: What Makes Us Stand Out

We understand that trust in medical equipment begins with reliable quality and transparent expertise. Here’s how we earn your trust:

1. Trusted Medical-Grade Technology

Every 5-liter adjustable oxygen therapy unit we manufacture utilizes pressure swing adsorption (PSA) technology—the gold standard for portable medical oxygen. Our system utilizes American-made molecular sieves and an all-copper, oil-free compressor, coupled with an AI-powered breath synchronization algorithm, delivering a perfect oxygen pulse (up to 99.99% synchronization) to your breathing rhythm and achieving 99.99% oxygen utilization. Across flow rates 1-7, oxygen concentration remains stable at 93% ± 3%—compliant with CE and ISO international medical standards—providing you with uncompromising purity. We never cut corners. Every unit undergoes 72 hours of continuous operation testing before shipment, rigorously checking oxygen concentration, noise level (≤60dB), and alarm functions (overheating, low battery, and no breathing detection) to ensure it works when you need it most.

2. Portability that fits your life

We believe oxygen support shouldn’t be a burden. Weighing only 2.2 kg (4.85 lbs), our 5-liter oxygen concentrator is compact and portable, suitable for packing in a backpack or carrying in one hand. It supports three power modes (AC 100-240V, DC 12V vehicle charging, and a removable 7680mAh battery). Whether you’re out walking, shopping, traveling to high altitudes (0-5000m adaptive), or simply moving from the bedroom to the living room, it’s ready to go. Say goodbye to a stationary machine.

3. Strict Quality Inspection，72-hour Hardiness Testing

We check oxygen consistency in -10℃ cold and 40℃ heat, test noise levels (≤60dB—quieter than a coffee maker, so it won’t wake you at night), and trigger fail-safes (low battery, overheating, no breathing detection) to make sure alerts kick in within 10 seconds. We don’t cut corners—because your trust can’t have gaps.

Designed for Your Life: No More Compromises

We built this machine to fit your lifestyle, not the other way around:

1.Lightweight and portable

Weighing only 2.2 kg, it fits in a backpack, handbag, or the included travel bag, making it perfect for walks in the park, shopping trips, or cross-country excursions—no need to lug a heavy oxygen tank.

2.Long-lasting power

The removable 7680 mAh battery lasts 2-6 hours (depending on flow rate), enough for a full day of hiking or a round-trip drive. Plus, it’s compatible with both AC power (ideal for home/hotel use) and DC car chargers (perfect for road trips), so you’ll never be without power.

3.Easy to use for everyone

The 3-inch color screen features large backlit buttons, allowing you to adjust flow rates (1-7) or switch between pulse (P1-P6) and continuous (P7) modes, even through reading glasses. We’ve also added an automatic humidification port to say goodbye to nasal dryness and irritation from prolonged use.

4.Altitude acclimatization

It automatically adapts to altitudes from 0 to 5000 meters, keeping your oxygen stable whether you’re skiing in Colorado or exploring the Swiss Alps.

We’re Here for You—Long After You Buy

Your partnership with 5lo2 doesn’t end with the arrival of your device. We’ll be with you every step of the way:

Free, one-on-one pre-purchase consultation: Not sure which flow rate you need? Unsure which oxygen concentrator is right for you? Our respiratory care experts will help you choose the right device for your needs.
One-year, comprehensive warranty: We offer a one-year warranty, and if a malfunction (not caused by user intervention) occurs, we’ll address it immediately.
24/7 customer support: Having trouble changing your filter? Want to know how to switch to high altitude mode? Email us anytime and our team will respond in 10 minutes or less. We’ll even send you a step-by-step video if you need it.
Trusted privacy: Your health information (e.g., why you need oxygen, your oxygen habits) is encrypted and never shared with third parties. We treat your privacy as we would our own.

From Our Customers: Real Stories, Real Relief

Trust isn’t just about product specifications; it’s about how our products work for you. Here’s what customers are saying:

I’ve lived with chronic obstructive pulmonary disease (COPD) for five years and used a bulky home oxygen concentrator until I found the 5lo2. This 2.2 kg concentrator fits in my backpack, and now I can finally enjoy trips to the park and weekend hikes with my grandchildren. The P4 pulse mode keeps pace with my breathing, and the battery lasts for 5 hours easily. When I had questions about changing the filter, the customer service staff guided me through it. This machine has completely changed my life.”
——Margaret T., 68, COPD patient in Florida

“We took a family road trip to the Rockies last month，my husband gets bad altitude sickness, so we brought the 5lo2 concentrator. It automatically switched to high-altitude mode at 3800m, and he didn’t have a single headache. We used the car charger during drives and the battery for hikes，never missed a beat. The quiet operation even let him use it in the hotel room without disturbing the kids.”
——David L., 45 (traveler, Texas)

“My dad had heart surgery 3 months ago, and his doctor recommended long-term oxygen therapy. The 5lo2 machine’s P7 continuous mode is perfect for his weak breathing，no more worrying about him missing a breath. The 3-inch screen is easy for him to read, and the humidification feature means he doesn’t complain about dry nose anymore. ”
——Sarah M., 32 (caregiver, California)

“As a construction worker in Colorado, I often work at 4000m. This concentrator is my lifeline，light enough to carry up ladders, and the 12V car charger keeps it powered between sites. I’ve used cheaper brands before, but none kept oxygen concentration stable like this one. The 1-year warranty gave me peace of mind, and the filter cotton is so easy to replace.”
—— Mike R., 51 (high-altitude worker, Colorado)

Our Vision

We’re committed to innovating for the future of portable oxygen care. Every design choice—from the 3-inch easy-to-read color screen (perfect for older users) to the automatic humidification system (no more dry nasal passages)—is rooted in solving real user pain points. We’re not just building devices，we’re building confidence for people with respiratory needs, cardiovascular conditions, altitude sickness, or post-op recovery to live actively, safely, and fully.