The O2Max puts blood oxygen one tap away — with on-demand ECG, heart rate, blood pressure and sleep tracking built into a classic round watch. No cuff, no appointment, no subscription. An IP67 body handles real life.
✓ Free shipping ✓ 30-day money-back guarantee ✓ Works with iPhone & Android
Six everyday health checks, one glance — on a classic round face that never looks like a gadget.
Continuous tracking that taps you on the wrist when your numbers step out of line.
Record an electrocardiogram in moments and keep every trace filed for your doctor.
Check your oxygen saturation any time — one tap, a few seconds, full clarity.
A 380mAh battery covers days of tracking, and the magnetic charger snaps itself into place.
Light, deep and REM stages tracked automatically while you rest.
Rain, sweat, hand-washing and everyday knocks are all part of the plan.
That afternoon slump, the racing pulse on a hill, the restless nights — they all leave fingerprints in your data. The O2Max gathers them quietly and shows you the pattern, so small habits can change before small problems grow.
No cuff on the shelf, no appointment, no rolling up your sleeve. Glance at your wrist over breakfast and your reading is there — logged, charted and ready to show your doctor at the next visit.
For wellness tracking and awareness — not a replacement for a medical blood pressure monitor.
Feel something odd? Press the sensor and the O2Max records an electrocardiogram in about half a minute, using the same electrical principle as clinic machines. The moment passes — the trace stays.
Designed for awareness and conversation with your physician — not for diagnosis.
Wear it to bed and wake to a full report: light, deep and REM sleep, overnight heart rate, and how tonight compared to last week. Once you can see your sleep, you can fix it.
Low oxygen saturation can show up as brain fog, breathlessness and restless nights long before anything obvious. The O2Max checks your SpO₂ in seconds and watches it overnight, so you see the dips — and what they line up with.
No plastic-gadget look. The O2Max wears like the round watch you have always owned — zinc-alloy case, crisp 1.38-inch display — while the sensors underneath quietly work around the clock.
| REXQU O2Max | Big-Brand Smartwatch | Basic Fitness Band | |
|---|---|---|---|
| On-wrist ECG recording | ✓ | ✓ (top models) | ✗ |
| Blood pressure awareness | ✓ | ✗ (most models) | ✗ |
| Blood oxygen (SpO₂) checks | ✓ | ✓ | Partial |
| Classic round watch look | ✓ | ✗ (most are square) | ✗ |
| Sleep-stage tracking | ✓ | ✓ | Partial |
| Four strap materials in one line-up | ✓ | ✗ | ✗ |
| 1.38″ round always-classic display | ✓ | Varies | ✗ |
| IP67 waterproof | ✓ | ✓ | ✓ |
| Subscription required | Never | Often | Often |
| Price | $169.97 | $399–$799 | $99+ |
“The oxygen reading is why I bought it. One tap at the top of a hill and I know exactly how I am doing before I push on.”
“The ECG takes half a minute with my morning coffee, and every trace is saved for my cardiologist. He asked me where I got it.”
“I bought it for my husband after his check-up. It looks like the watch he has always worn — but now we can both see his numbers.”
Every order is covered by our 30-day money-back guarantee — with free tracked shipping and easy returns. Love it, or send it back. No questions, no fuss.
Silicone for the gym, leather for dinner, steel for the office — every strap carries the identical sensor suite. Tap one to order it.
From clean analogue dials to bold health dashboards, the app’s face library restyles your O2Max in seconds — and a photo of your own makes it truly yours.
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1000W GaN technology · 10 ports · charge laptops, phones, tablets and more simultaneously. Ships with your order.
One click — your saved card is charged instantly. This offer is only available right now.
One click — your saved card is charged instantly. This offer disappears when you leave.
A receipt is on its way to your email. Your O2Max ships within 24–48 hours.
Wear the O2Max every day for a month. If it doesn't make you feel more in tune with your health, send it back for a full refund — no questions, no hassle.
Yes — iPhone and Android both work over Bluetooth. The free companion app stores your readings, trends, sleep reports and ECG history.
Nothing. ECG, blood pressure, SpO₂, sleep tracking and heart-rate alerts all come fully enabled, free forever.
Treat them as an early-warning companion. The O2Max is a wellness device — brilliant for spotting trends and prompting conversations with your doctor, but not a replacement for medical equipment.
A full charge comfortably covers days of normal use — most wearers top up once or twice a week with the snap-on magnetic charger.
IP67 water resistance handles rain, sweat, hand-washing and everyday knocks — and the zinc-alloy case shrugs off the daily grind.
You have 30 days and a full money-back guarantee, with free tracked shipping both ways on qualifying returns. No questions, no fuss.
Join 50,000+ people who check in with their body every morning. Today: $169.97 instead of $300.00, with free shipping and a 30-day guarantee.
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