Xiaomi announced the Watch S4 Sport in mainland China on July 19, 2024. It is a rugged, outdoor-focused smartwatch with a titanium case, sapphire glass, standalone eSIM communication, dual-frequency five-system GNSS, offline maps and reported diving support to 40 meters. The launch price started at 1,999 yuan for fluororubber and liquid-silicone strap versions; a titanium Milanese configuration cost 2,599 yuan. Unisoc identified the watch’s W117 platform on July 31, describing a 22nm, low-power design for eSIM communication and a lightweight RTOS.
What Xiaomi actually launched
The Xiaomi Watch S4 Sport is a China-market professional sports smartwatch, not simply a renamed regular Watch S4. Xiaomi’s launch materials emphasize outdoor navigation, endurance sports, cellular independence and diving-related functions. The available evidence confirms a China announcement and China purchase pages, but not an official US or European launch.
Do not confuse it with the regular Xiaomi Watch S4 listed on Xiaomi’s global website. That model has an aluminum frame, a 486mAh battery and 5ATM water resistance, while the Sport is reported with titanium construction, a 586mAh battery and a more specialized outdoor brief. The global specification page is for comparison only: Xiaomi Watch S4 global specifications.
Xiaomi’s China product information is available at the Watch S4 Sport specification page, the eSIM page and the China purchase page.
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#1 Best Overall
- Stunning images, smooth touch: Immerse yourself in brilliant clarity with the large 1.72-inch AMOLED display.Vacuum filling sealing technology enables symmetrical 2.0mm ultra-thin bezels, expanding screen-to-body ratio from 66% to 73%. Enjoy incredibly smooth and seamless interaction with crisp, color-accurate images, right on your wrist.
- Fast charging, longer adventures: Say goodbye to daily charging hassles! Enjoy an exceptional 21 days of battery life on a single charge. And when you need more power, it only takes an hour to fully recharge the device with fast charging. Freedom without limits!
- Revolutionize your swimming and training sessions: The Xiaomi smartwatch is equipped with a new high-precision electronic compass that tracks swimming direction like never before, delivering unparalleled accuracy for pool sessions. Plus, gain detailed insights through professional analysis of your workouts to optimize each session.
- Master your nighttime recovery: Discover the secrets of your sleep with comprehensive and enhanced sleep monitoring. Get comprehensive insights into your sleep stages and quality, helping you wake up refreshed and optimize your well-being.
- 1500 nits HBM brightness,Glanceable in any light:25% brighter than before, the display achieves a remarkable 1500 nits HBM brightness, making every message readable even in direct sunlight.
Price: 1,999 yuan is the starting configuration
| Configuration | Launch price |
|---|---|
| Fluororubber outdoor strap | 1,999 yuan |
| Liquid-silicone outdoor strap | 1,999 yuan |
| Titanium Milanese strap | 2,599 yuan |
The 1,999-yuan figure therefore does not cover every version. Launch coverage listed the fluororubber strap separately at 149 yuan and the titanium Milanese strap at 699 yuan. These are China launch prices, not a current delivered US price; exchange rates, tax, shipping and reseller margins can change an imported purchase substantially. The configuration breakdown was reported by Sina Finance.
What the Unisoc W117 tells us
Unisoc disclosed the W117 connection after Xiaomi’s announcement. According to the July 31 report from IT之家, the platform uses a 22nm process and supports independent eSIM communication, a lightweight real-time operating system, high integration, small size and low power consumption.
That makes the W117 relevant to the Sport’s standalone cellular capability, but the public information is limited. No verified specification establishes its CPU cores, clock speed, GPU, RAM, storage, benchmark performance or whether it runs every watch function. It is more accurate to call it the watch’s disclosed Unisoc connectivity and low-power platform than to rank it against Snapdragon Wear or Apple S-series processors.
Rank #2
- Two year warranty against factory defects.
Hardware built for outdoor use
- One-piece titanium body.
- Sapphire-glass front and rear covers, according to launch reporting.
- Round case with a rotating crown and two function buttons.
- 1.43-inch AMOLED display.
- Reported peak brightness of 2,200 nits.
- 586mAh battery.
The 2,200-nit number should be read as a peak figure, not necessarily sustained full-screen brightness in every situation. Xiaomi’s regular Watch S4 documentation distinguishes peak or high-brightness modes from ordinary operation, so outdoor visibility will still depend on ambient light, display mode and software settings.
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Sports, training and navigation features
Lactate-threshold testing
The watch was presented with lactate-threshold testing intended to estimate an endurance athlete’s aerobic threshold and help set heart-rate and pace targets. Launch materials said Suunto contributed to the lactate-threshold and training algorithms. This is a training aid, not an independently validated laboratory measurement; the available material contains no independent accuracy study.
Dual-frequency GNSS
Dual-frequency, five-system GNSS can potentially improve positioning in difficult environments such as urban canyons, forests and mountains by reducing some multipath errors. No independent GPS accuracy test was found for this model, so the feature should be treated as a capability claim rather than proof of a particular track quality.
Rank #3
- WHY GALAXY WATCH8: Advanced health and sleep tracking features.* A lighter, more snug design for all day comfort.* Improved user interface.* Personal AI assistant for hands free help.⁴* 2-Year Warranty.
- SLEEP SMARTER. LIVE BETTER: Energize your days with a great night’s rest using Advanced Sleep Coaching¹ - improved with even more ways to keep your nights on track. Plus, Bedtime Guidance² helps you find your optimal bedtime.
- YOUR RUN, YOUR COACH: Step up your running routine with a Running Coach³ that analyzes your performance and gives you real-time feedback. Training for an event? Try specific programs built for 5Ks, marathons and more.
- NEW DESIGN. LIGHTWEIGHT FEEL: Maximize your days with a minimalist design. The sleek, thinner-than-ever silhouette makes Galaxy Watch8 look as good as it functions. With a snug fit and sporty style, it gives you readings without getting in your way.
- A PERSONAL ASSISTANT, RIGHT ON YOUR WRIST: Your Watch just became your personal assistant.⁴ Stay one step ahead of your day with a watch that helps you navigate your tasks and to-do lists.
Offline maps and route recovery
Reported route tools include offline map import, track-back navigation, straight-line return and off-course alerts. Those functions are useful when a runner or hiker leaves phone coverage, but map-region support, import steps, map detail and phone independence can vary by firmware. Check Xiaomi’s China documentation before relying on them for a specific country or route.
Diving: useful support, not automatically a dive computer
Launch coverage reported diving support to 40 meters and references to PADI inspection or certification claims and EN13319-related certification. These statements should be attributed to Xiaomi’s launch material and should not be expanded into a claim that the watch replaces dedicated diving equipment.
Before using it underwater, verify the official manual’s supported dive modes, operating limits, decompression information, certification scope and software support. Water resistance or a certification reference does not guarantee protection against every type of water damage, nor does it establish suitability for technical or decompression diving.
Rank #4
- 𝐒𝐭𝐮𝐧𝐧𝐢𝐧𝐠 𝟏.𝟑𝟐" 𝐀𝐌𝐎𝐋𝐄𝐃 𝐃𝐢𝐬𝐩𝐥𝐚𝐲 & 𝐏𝐫𝐞𝐦𝐢𝐮𝐦 𝟒𝟏𝐦𝐦 𝐒𝐭𝐚𝐢𝐧𝐥𝐞𝐬𝐬-𝐒𝐭𝐞𝐞𝐥 𝐁𝐮𝐢𝐥𝐝 Featuring a vibrant 1.32" AMOLED screen with 466×466 resolution, 352 PPI, 60Hz refresh rate, and up to 1500 nits HBM brightness, the Xiaomi Watch S4 41mm stays crystal-clear even under direct sunlight. The sleek stainless-steel bezel and lightweight 32g case (9.5mm thin) pair effortlessly with both business attire and workout gear.
- 𝐔𝐩 𝐭𝐨 𝟖 𝐃𝐚𝐲𝐬 𝐁𝐚𝐭𝐭𝐞𝐫𝐲 & 𝐄𝐟𝐟𝐢𝐜𝐢𝐞𝐧𝐭 𝐌𝐚𝐠𝐧𝐞𝐭𝐢𝐜 𝐂𝐡𝐚𝐫𝐠𝐢𝐧𝐠 Say goodbye to daily charging. Get up to 8 days of light usage, 4 days typical, or 3 days heavy use on a single 320mAh charge. When power runs low, the 2-pin magnetic dock tops you back up quickly — 5 minutes of charging covers roughly 2 days of use. [Data from Xiaomi internal labs; actual results may vary.]
- 𝐂𝐨𝐦𝐩𝐫𝐞𝐡𝐞𝐧𝐬𝐢𝐯𝐞 𝐇𝐞𝐚𝐥𝐭𝐡 & 𝐖𝐞𝐥𝐥𝐧𝐞𝐬𝐬 𝐓𝐫𝐚𝐜𝐤𝐢𝐧𝐠 Stay in tune with your body via 24/7 heart rate, blood oxygen (SpO2), sleep staging (Deep/Light/REM), stress, and female health tracking — all visualized in the Mi Fitness App. A 6-sensor suite (accelerometer, gyroscope, ambient light, barometer, plus skin temperature sensor) captures both day and night, giving you a fuller picture of your wellness. [This product is not a medical device. Data is for wellness reference only.]
- 𝐗𝐢𝐚𝐨𝐦𝐢 𝐇𝐲𝐩𝐞𝐫𝐎𝐒 𝟑 & 𝐁𝐥𝐮𝐞𝐭𝐨𝐨𝐭𝐡 𝐂𝐚𝐥𝐥𝐢𝐧𝐠 𝐨𝐧 𝐘𝐨𝐮𝐫 𝐖𝐫𝐢𝐬𝐭 Powered by Xiaomi HyperOS 3 with Bluetooth 5.4, enjoy smooth interactions and take Bluetooth calls directly from your wrist (1 mic + speaker built in). Control your phone camera, manage music, use built-in NFC* for contactless payments, and seamlessly trigger Xiaomi Smart Home devices on the go. [*NFC availability varies by region.]
- 𝟏𝟓𝟎+ 𝐒𝐩𝐨𝐫𝐭𝐬 𝐌𝐨𝐝𝐞𝐬 𝐰𝐢𝐭𝐡 𝟓𝐀𝐓𝐌 & 𝐁𝐮𝐢𝐥𝐭-𝐢𝐧 𝐆𝐍𝐒𝐒 From running to swimming to HIIT — 150+ pro sports modes auto-detect workouts and deliver real-time stats. Rated 5ATM water-resistant (up to 50m), swim-ready for pool and shallow-water sessions. Backed by built-in 5-system GNSS (GPS + Galileo + Glonass + BeiDou + QZSS) for accurate outdoor tracking without your phone.
Battery life depends heavily on the mode
| Use case | Claimed endurance | Qualification |
|---|---|---|
| Standard use | Up to 15 days | Xiaomi or launch-material estimate |
| eSIM mode | Up to 9 days | Claimed estimate with cellular enabled |
| Dual-frequency, dual-satellite sports mode | Up to 26 hours | Claimed workout-mode estimate |
Actual results will change with always-on display use, brightness, GNSS recording, cellular signal strength, calls, notifications, music, health monitoring, temperature and workout duration. The 15-day figure is not an independent endurance test. It also must not be borrowed from the regular Watch S4’s separate 486mAh specification.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can an international buyer use the eSIM?
There is no evidence here confirming US carrier activation, international roaming, non-Chinese carrier provisioning, emergency calling abroad or support for a particular smartwatch plan. A US or European buyer should treat the Watch S4 Sport as a China-market import unless Xiaomi and the intended carrier explicitly confirm compatibility.
- Carrier activation may fail even when the hardware supports eSIM.
- China firmware may impose language, payment, map or service restrictions.
- Reseller “global version” claims do not prove official Xiaomi warranty coverage.
- Import taxes, shipping and returns can materially increase the purchase cost.
The available material also does not provide a confirmed Sport-specific operating-system specification. Xiaomi’s global regular Watch S4 pages list HyperOS 2 and Android 8.0/iOS 14 compatibility, but those details should not automatically be assigned to the Sport.
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- 𝐒𝐭𝐮𝐧𝐧𝐢𝐧𝐠 𝟏.𝟑𝟐" 𝐀𝐌𝐎𝐋𝐄𝐃 𝐃𝐢𝐬𝐩𝐥𝐚𝐲 & 𝐏𝐫𝐞𝐦𝐢𝐮𝐦 𝟒𝟏𝐦𝐦 𝐒𝐭𝐚𝐢𝐧𝐥𝐞𝐬𝐬-𝐒𝐭𝐞𝐞𝐥 𝐁𝐮𝐢𝐥𝐝 Featuring a vibrant 1.32" AMOLED screen with 466×466 resolution, 352 PPI, 60Hz refresh rate, and up to 1500 nits HBM brightness, the Xiaomi Watch S4 41mm stays crystal-clear even under direct sunlight. The sleek stainless-steel bezel and lightweight 32g case (9.5mm thin) pair effortlessly with both business attire and workout gear.
- 𝐔𝐩 𝐭𝐨 𝟖 𝐃𝐚𝐲𝐬 𝐁𝐚𝐭𝐭𝐞𝐫𝐲 & 𝐄𝐟𝐟𝐢𝐜𝐢𝐞𝐧𝐭 𝐌𝐚𝐠𝐧𝐞𝐭𝐢𝐜 𝐂𝐡𝐚𝐫𝐠𝐢𝐧𝐠 Say goodbye to daily charging. Get up to 8 days of light usage, 4 days typical, or 3 days heavy use on a single 320mAh charge. When power runs low, the 2-pin magnetic dock tops you back up quickly — 5 minutes of charging covers roughly 2 days of use. [Data from Xiaomi internal labs; actual results may vary.]
- 𝐂𝐨𝐦𝐩𝐫𝐞𝐡𝐞𝐧𝐬𝐢𝐯𝐞 𝐇𝐞𝐚𝐥𝐭𝐡 & 𝐖𝐞𝐥𝐥𝐧𝐞𝐬𝐬 𝐓𝐫𝐚𝐜𝐤𝐢𝐧𝐠 Stay in tune with your body via 24/7 heart rate, blood oxygen (SpO2), sleep staging (Deep/Light/REM), stress, and female health tracking — all visualized in the Mi Fitness App. A 6-sensor suite (accelerometer, gyroscope, ambient light, barometer, plus skin temperature sensor) captures both day and night, giving you a fuller picture of your wellness. [This product is not a medical device. Data is for wellness reference only.]
- 𝐗𝐢𝐚𝐨𝐦𝐢 𝐇𝐲𝐩𝐞𝐫𝐎𝐒 𝟑 & 𝐁𝐥𝐮𝐞𝐭𝐨𝐨𝐭𝐡 𝐂𝐚𝐥𝐥𝐢𝐧𝐠 𝐨𝐧 𝐘𝐨𝐮𝐫 𝐖𝐫𝐢𝐬𝐭 Powered by Xiaomi HyperOS 3 with Bluetooth 5.4, enjoy smooth interactions and take Bluetooth calls directly from your wrist (1 mic + speaker built in). Control your phone camera, manage music, use built-in NFC* for contactless payments, and seamlessly trigger Xiaomi Smart Home devices on the go. [*NFC availability varies by region.]
- 𝟏𝟓𝟎+ 𝐒𝐩𝐨𝐫𝐭𝐬 𝐌𝐨𝐝𝐞𝐬 𝐰𝐢𝐭𝐡 𝟓𝐀𝐓𝐌 & 𝐁𝐮𝐢𝐥𝐭-𝐢𝐧 𝐆𝐍𝐒𝐒 From running to swimming to HIIT — 150+ pro sports modes auto-detect workouts and deliver real-time stats. Rated 5ATM water-resistant (up to 50m), swim-ready for pool and shallow-water sessions. Backed by built-in 5-system GNSS (GPS + Galileo + Glonass + BeiDou + QZSS) for accurate outdoor tracking without your phone.
Watch S4 Sport versus regular Watch S4
| Feature | Watch S4 Sport | Regular Watch S4 |
|---|---|---|
| Positioning | Outdoor and professional sports | General-purpose smartwatch |
| Body | Titanium reported | Aluminum alloy on Xiaomi’s global page |
| Battery | 586mAh reported | 486mAh |
| Water or diving claim | 40-meter diving support reported | 5ATM shallow-water use on global page |
| Cellular | Standalone eSIM communication reported | Region-dependent versions |
| Launch pricing | China from 1,999 yuan | Separate model and pricing |
| Availability evidence | China launch and China sales pages | Global Xiaomi listings exist |
Regular Watch S4 comparison specifications come from Xiaomi’s global product page, not from the Sport model.
Who should consider it?
Good fit
- China-based Xiaomi users needing supported standalone cellular service.
- Runners, hikers and outdoor users interested in dual-frequency GNSS and offline routes.
- Buyers who value titanium, sapphire and a bright AMOLED display.
- Users who prefer multi-day stated endurance over a large smartwatch app ecosystem.
Poor fit
- Anyone requiring confirmed US or European retail, carrier activation or warranty.
- Buyers seeking Wear OS, watchOS or a broad third-party app catalog.
- Athletes who require independently tested GPS or heart-rate accuracy.
- Divers who need a dedicated computer with documented decompression functions.
- Anyone simply looking for Xiaomi’s least expensive smartwatch.
Bottom line
The Watch S4 Sport is technically interesting: it combines a disclosed 22nm Unisoc W117 platform, eSIM communication, titanium and sapphire construction, dual-frequency GNSS, offline navigation and diving-related features. The price story is also specific: 1,999 yuan covered the two base strap configurations, while the titanium Milanese version was 2,599 yuan.
For international buyers, however, it is not a straightforward import. China-market availability, carrier provisioning, firmware, maps, language support and warranty remain decisive unknowns. Buy it only after confirming those details for your country and intended carrier, and do not treat the diving claims as proof that it replaces professional dive equipment.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
