REXQU O2Max Health Watch
$169.97$300.0043% OFF
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✓ Free shipping✓ 30-day returns✓ Ships in 24–48h
The O2Max puts blood oxygen one tap away — with on-demand ECG, HRV reports, body composition 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 heart-rate tracking with alerts, plus a full heart-rate-variability report charted in the app.
BMI, body fat, muscle rate, body water, bone mass and protein — scanned from your wrist and charted over time.
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 you can spot trends and build healthier habits.
Heart-rate variability — the tiny changes between heartbeats — is one of the most telling indicators of how your cardiovascular system is coping. The O2Max measures it and turns it into a proper HRV report in the app, complete with a Lorentz plot you can compare against the normal reference shape.
For wellness tracking and awareness — not medical diagnosis.
Step on no scale. The O2Max runs a body composition analysis right from your wrist and breaks you down into the numbers that matter — BMI, body fat, muscle rate, body water, skeletal muscle, bone mass and protein — all charted in the app.
For wellness awareness and fitness tracking — not medical diagnosis.
Feel something odd? Record an electrocardiogram right from your wrist. The O2Max adds a user calibration mode for more reliable readings, and its ECG analysis rates underlying heart risks — myocardial, arrhythmia and coronary artery — in a health report you can export and show your doctor.
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.
The O2Max doesn’t stop at blood oxygen: it offers experimental glucose trend estimates — wellness insights only, not medical readings — around the clock (experimental wellness estimates) with a dynamic curve report in the app. A blood component analysis offers experimental trend estimates for other blood components, and body temperature sits right on the watch face. Wellness estimates, not a medical device.
Slide the SOS icon and the O2Max calls your emergency contact and notifies them — one touch, no phone hunting. Turn on fall detection and the watch automatically calls for help 10 seconds after an accidental fall. Peace of mind for anyone who lives alone, and for everyone who loves them.
No plastic-gadget look. The O2Max wears like the round watch you have always owned — metal-alloy body, crisp 1.55-inch display — while the sensors underneath quietly work around the clock.
| REXQU O2Max | Big-Brand Smartwatch | Basic Fitness Band | |
|---|---|---|---|
| HRV report (Lorentz plot) | ✓ Included | ✓ (top models) | ✗ |
| Body composition analysis | ✓ 9 metrics | Some models | ✗ |
| Blood oxygen (SpO₂) checks | ✓ | ✓ | Partial |
| Classic round watch look | ✓ | ✗ (most are square) | ✗ |
| Sleep-stage tracking | ✓ | ✓ | Partial |
| Four strap materials in one line-up | ✓ | ✗ | ✗ |
| 1.55″ round always-classic display | ✓ | Varies | ✗ |
| IP67 waterproof | ✓ | ✓ | ✓ |
| Subscription required | Never | Often | Often |
| 150+ sports modes | ✓ Included | ✓ | Limited |
| On-wrist ECG + heart-risk report | ✓ Included | ✓ (top models) | ✗ |
| Glucose trend estimates | ✓ Included | Some models | ✗ |
| Extra wellness indicators | ✓ Included | ✗ | ✗ |
| Fall detection + SOS | ✓ Included | ✓ (top models) | ✗ |
| Battery life | ✓ 7–15 days | 1–2 days | ✓ |
| 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 oxygen check takes seconds with my morning coffee, and every reading is saved in the app for my next check-up.”
“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 HRV history.
Nothing. SpO₂, ECG, HRV reports, body composition, 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 metal-alloy body 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 the 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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