Built to Take It. Every Day.
EnduroMax is a durable smartwatch for people who are hard on watches. A zinc-alloy outdoor smartwatch with a 1.43-inch AMOLED display, continuous heart-rate trends, on-demand SpO₂ estimates, sleep tracking, Bluetooth calling, 100+ sports modes and up to 15-day listed battery life.
✓ Free shipping ✓ 30-day money-back guarantee ✓ Works with compatible iPhone & Android phones
EnduroMax combines a reinforced metal case, bright AMOLED display and outdoor-ready controls with fitness and general wellness features.
466×466 pixels at 650 nits with always-on support — bright enough for noon sun, sharp enough for small print.
A zinc-alloy case with reinforced side armor and IP68 & 1ATM water resistance shrugs off rain, sweat and rough handling.
The optical sensor tracks heart-rate patterns across supported daily activity, sleep and workouts.
Review estimated blood-oxygen trends for general wellness and fitness awareness.
Automatic sleep monitoring plus steps, calories and sedentary reminders keep the full picture in view.
Bluetooth 5.2 calling with speaker and mic, 100+ sport modes and a 410mAh battery that runs up to 15 days.

EnduroMax combines a zinc-alloy case, reinforced side protection and dedicated POWER and SPORT buttons with listed IP68 and 1ATM water resistance. Compare it with other REXQU rugged and outdoor smartwatches.
The optical sensor tracks heart-rate trends across supported daily activity, sleep and workouts, with history shown in the Da Fit companion app. Explore more REXQU health smartwatches.
For wellness tracking and awareness — not a replacement for professional medical advice.


Take an estimated SpO₂ reading on demand and compare supported blood-oxygen trends in the companion app.
Designed for awareness and conversation with your physician — not for diagnosis.
When a compatible phone is connected and within Bluetooth range, the built-in speaker and microphone let you answer and control calls from your wrist.


Wear EnduroMax overnight to estimate sleep patterns, then review supported activity measures such as steps, calories and distance in the companion app.

The 1.43-inch AMOLED has a listed 466×466 resolution and up to 650-nit brightness. The 410mAh battery is rated for up to 15 days of typical use and charges in about 2.5 hours.
| REXQU EnduroMax | Big-Brand Smartwatch | Basic Fitness Band | |
|---|---|---|---|
| 1.43″ AMOLED at 650 nits | ✓ 466×466 pixels | ✓ | ✗ Small LCD |
| Rugged zinc-alloy case | ✓ Armored sides | Extra-cost models | ✗ |
| IP68 & 1ATM water resistance | ✓ Included | ✓ | Splash only |
| 24-hour heart rate | ✓ Included | ✓ | ✓ Basic |
| Blood oxygen (SpO₂) | ✓ On demand | ✓ | Some models |
| Sleep monitoring | ✓ Automatic | ✓ | ✓ Basic |
| Bluetooth calls (speaker + mic) | ✓ Included | ✓ | ✗ |
| Sport modes | 100+ | ✓ | ~20 |
| Battery per charge | Up to 15 days | 1–2 days | 5–7 days |
| Price | $149.97 | Varies | Varies |
“I work construction and this is the first watch that hasn’t cracked, scratched or quit on me. Charged it twice this month.”
“The battery claim is real — twelve days with calls and sleep tracking on. And I can actually read it in direct sun.”
“Answering calls from the wrist while both hands are on the ladder is the feature I didn’t know I needed.”
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.
All Black, or Black with the signature Orange armor — the same sensors, battery and rugged build under both.

Swap between analog-digital hybrids, bold data screens and clean classic dials right on the watch — plus a full library in the DAFit app.
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1000W GaN technology · 10 ports · charge laptops, phones, tablets and more simultaneously. Ships with your order.
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One click — your saved card is charged instantly. This offer disappears when you leave.
A receipt is on its way to your email. Your EnduroMax ships within 24–48 hours.
Wear the EnduroMax hard for a full month — job site, trail, gym, sleep. If it hasn’t earned the wrist space, send it back for a complete refund. No restocking fee, no interrogation.
Rugged and durable are marketing words until someone tells you what was tested. Here is what the ratings actually mean, and where the standards come from.
IP and ATM ratings describe a specific laboratory test at a specific pressure, in still fresh water, on a new seal. They do not describe diving, hot showers, salt water, or a five-year-old gasket. The IEC explanation of IP ratings is the actual standard behind the numbers. Treat any watch as splash-safe first and prove the rest slowly. Our rugged smartwatch buying guide walks through what each rating permits.
A zinc-alloy case takes an impact differently from plastic: it dents where plastic cracks, and it carries the bezel edge past the glass so the glass takes fewer direct hits. That is the practical argument for the extra weight on your wrist.
Straps and lugs fail long before cases do, and a broken strap loses you the whole watch. Check the pin design before you trust it on a worksite or a trail.
A watch that dies on day two is not durable in any way that helps you. Fifteen days of ordinary use is the design target here, and heavy GPS, calls and always-on display all draw it down. Health monitoring watch battery life explains what actually costs you the most.
Continuous heart-rate trends and on-demand SpO2 estimates are wellness features. They vary with fit, motion and circulation, and they are not clinical measurements — the American Heart Association target heart rate guide is the reference for what heart-rate numbers mean. Anything you would act on belongs with a clinician.
More from the range: rugged smartwatches · GPS smartwatches · all health smartwatches · smartwatches for construction work. Health statements follow our editorial and research standards.
Three things, in order: the case and bezel design, the seals around the buttons and sensor, and the strap fixings. A durable smartwatch is built so the glass sits below the bezel edge, so water and dust have no easy route in, and so the strap will not part company with the case. Screen scratches and dead batteries are what people actually experience as failure, and neither is fixed by a thick-looking case alone.
A little, yes. A zinc-alloy case weighs more than a plastic one, and that is the trade you are making for impact resistance. Most people stop noticing within a few days, but if you want the lightest possible watch for sleep tracking, a lighter build is the better choice.
EnduroMax pairs with compatible Android phones and iPhones through Bluetooth 5.2 and uses the free Da Fit companion app.
No. The companion app and the watch's listed calling, activity and wellness-tracking features do not require a monthly subscription.
EnduroMax has a 1.43-inch AMOLED display with a listed 466 by 466 resolution, up to 650-nit brightness and always-on display support.
The watch uses a zinc-alloy case with reinforced sides, dedicated power and sport buttons, and listed IP68 and 1ATM water resistance.
Yes. EnduroMax provides continuous heart-rate trend tracking for general wellness and fitness awareness.
EnduroMax provides on-demand SpO₂ estimates for reviewing general wellness and fitness trends. It is not intended for diagnosis.
The watch estimates overnight sleep patterns and records supported activity data such as steps, calories and distance in the companion app.
EnduroMax lists more than 100 sports modes for recording supported workout and activity data.
No. Calls use Bluetooth, so a compatible paired phone must remain within range. The watch's speaker and microphone handle the conversation.
The 410mAh battery is listed for up to 15 days of typical use. Actual runtime varies with display, calling, notifications and monitoring settings; a full charge takes about 2.5 hours.
EnduroMax orders are covered by a 30-day return window. Review the REXQU returns policy for the current terms and instructions.
Get a zinc-alloy outdoor smartwatch with a bright AMOLED display, 100+ sports modes, Bluetooth calling and up to 15-day listed battery life. Today: $149.97.
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