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Xiaomi previewed the standard Xiaomi Watch S4 and Smart Band 9 Pro on October 28, 2024, ahead of a China launch event the following day. The teasers highlighted a customizable watch bezel, a redesigned fitness band and brighter displays; the final specifications later confirmed two distinct propositions: a round smartwatch with Bluetooth calling, and a slimmer fitness tracker with longer claimed battery life.
What Xiaomi teased before the launch
The October 28 preview placed the Watch S4 and Smart Band 9 Pro alongside Xiaomi’s upcoming Xiaomi 15 and HyperOS 2 announcements. Images showed the products’ designs, but Xiaomi had not yet published the standard Watch S4’s full specifications. A contemporary report also described a new communication or “intercom” feature. Because the precise function was not established in the available launch information, it is best understood as a teaser claim—not proof of walkie-talkie operation, cellular service or emergency communications. Gizmochina’s October 28 report also relayed pre-launch expectations that should not be confused with final specifications.
Watch S4: customization was the visual hook
The teaser emphasized an interchangeable bezel, giving the round Watch S4 a more conventional watch-style customization option. Xiaomi’s product material also describes a rotating crown. The bezel is a styling feature; it does not, by itself, mean the display or interface is mechanically configurable.
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Smart Band 9 Pro: a reshaped display
The Band 9 Pro appeared with a rectangular, narrow-edge display design and was promoted as having a brighter screen. The teaser established the design direction, not every specification later attached to the product.
#1 Best Overall
- 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.
What was confirmed at the October 29 event
Xiaomi launched both products in China on October 29, 2024, as part of a broader event covering phones, tablets, HyperOS 2 and other ecosystem products. Xiaomi’s UK Watch S4 FAQ gives that date as the watch’s official launch date. A China launch does not mean every product launched at the same time or with the same features in every country; availability and functions can vary by market.
Xiaomi Watch S4: confirmed standard-model specifications
The following figures are for the standard Watch S4, not the separate Watch S4 Sport or the later Watch S4 41mm. Xiaomi’s global specification page lists:
Rank #2
- Two year warranty against factory defects.
- Display: 1.43-inch AMOLED, 466 × 466 pixels, 326 PPI and a 60Hz refresh rate, with interface-dependent variation.
- Brightness: 1,500 nits HBM on the global specifications page. Regional promotional material also cites 2,200 nits peak brightness; HBM and peak brightness are different measurement terms, so the figures should not be treated as directly interchangeable.
- Case: 47.3 × 47.3 × 12.0mm, aluminum-alloy frame and approximately 44.5g without the included strap.
- Battery: 486mAh, with Xiaomi claiming up to 15 days under typical use. Actual runtime varies with settings and use.
- Location and sensors: GNSS support for GPS, Galileo, GLONASS, BeiDou and QZSS; heart-rate and blood-oxygen sensor, accelerometer, gyroscope, ambient-light sensor, electronic compass, barometer and Hall sensor.
- Calls and connections: Bluetooth calling, two microphones and Bluetooth 5.3.
- Other specifications: 5ATM water resistance, Xiaomi HyperOS 2 on the cited global page, and a two-pin magnetic charging dock.
- Compatibility: Android 8.0 or later and iOS 14.0 or later.
Bluetooth calling is not the same as cellular calling: it requires the watch to stay connected to a smartphone. The global specification page does not establish universal cellular independence for this model. Do not transfer eSIM features associated with the Watch S4 Sport or China-specific versions to every standard Watch S4.
Xiaomi Smart Band 9 Pro: confirmed specifications
Xiaomi’s global Smart Band 9 Pro product page describes a fitness-focused band with these features:
Rank #3
- STYLISH DESIGN, BRIGHT DISPLAY: The sleek stainless steel build blends classic style with workout durability, while the bright 1.32" AMOLED display keeps your data easy to read, even under bright sunlight.
- PRECISE HEART RATE AND SLEEP TRACKING: Amazfit's BioTracker technology tracks your heart rate and sleep data with accuracy that previous sensors just can't match.
- UP TO 10 DAYS OF BATTERY LIFE: With long battery life that lasts up to 10 days with typical use, nightly recharges are a thing of the past.
- FREE MAPS WITH TURN DIRECTIONS: Stay on-track with free downloadable maps, and get turn-by-turn guidance on-screen or via your Bluetooth headphones. Enjoy ski maps for global resorts, including guidance for cable cars, slopes, and more.
- FASTER AND MORE ACCURATE GPS TRACKING: 5 satellite positioning systems ensure fast GPS connection and accurate positioning whenever you're out running, walking, cycling or hiking.
- Display and build: 1.74-inch AMOLED narrow-edge quadrilateral display, 60Hz refresh rate, 1,200 nits HBM brightness, 2.5D cover glass and aluminum-alloy frame. The listed colors are Rose Gold, Moonlight Silver and Obsidian Black.
- Location: independent GNSS supporting GPS, GLONASS, BeiDou, Galileo and QZSS. Xiaomi says positioning accuracy improves by 33% over the Smart Band 8 Pro; that is the manufacturer’s comparison, not an independently verified test result.
- Fitness and wellness: more than 150 sports modes, heart-rate and blood-oxygen monitoring, sleep and stress monitoring, women’s health management and breathing exercises. A linear motor provides haptic feedback.
- Battery claims: up to 21 days in typical-use mode, 10 days with always-on display (AOD), or 8 days in heavy-load mode, according to Xiaomi. GNSS use, brightness, notifications and other settings affect real-world endurance.
- Other specifications: 5ATM water resistance and Mi Fitness app support.
- Compatibility: Android 8.0 or later and iOS 12.0 or later.
Built-in GNSS enables route tracking for outdoor workouts without carrying a phone; it does not provide cellular service or make the band a full smartwatch. Xiaomi also says the health functions are not intended for medical diagnosis, prevention, prediction or treatment. Treat the readings as wellness information, not a substitute for clinical devices or medical advice. Xiaomi warns that a loose fit can affect heart-rate, blood-oxygen and sleep data.
What the pre-launch expectations got wrong
The most notable specification correction concerns the Band 9 Pro display. The October 28 report relayed an expectation of 600 nits and a 336 × 480 resolution. Xiaomi’s final global product page instead lists 1,200 nits HBM and emphasizes the 1.74-inch narrow-edge AMOLED panel. Those earlier figures belonged to pre-launch reporting, not the confirmed final global specification.
Rank #4
- 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.
Likewise, specifications for the Watch S4 Sport should not be used to fill gaps in the standard Watch S4’s pre-launch details. They are distinct models, and the standard watch should be assessed using its own confirmed global specifications.
Watch S4 or Smart Band 9 Pro?
| Priority | Better fit | Why |
|---|---|---|
| Traditional round-watch appearance | Watch S4 | Round case, interchangeable bezel and rotating crown. |
| Bluetooth calling | Watch S4 | Supports calls over its Bluetooth connection to a phone. |
| Longer stated battery life | Smart Band 9 Pro | Xiaomi claims up to 21 days in typical mode, with separate lower figures for AOD and heavy-load use. |
| Slimmer fitness-focused design | Smart Band 9 Pro | Band form factor with a large rectangular display and fitness features. |
| Phone-free route tracking during workouts | Either | Both cited global product pages list built-in GNSS; neither fact implies cellular service. |
| More watch-like connected experience | Watch S4 | It adds Bluetooth calling and watch styling; the Band 9 Pro is oriented more toward fitness tracking. |
Neither is a universal winner. The Watch S4 suits buyers who want a conventional watch design and calling through a paired phone. The Band 9 Pro is the more fitness-oriented choice for someone prioritizing a band form, phone-free GNSS routes and Xiaomi’s longer typical-use battery claim. No verified, comparable regional prices are established here, so price should be checked with the Xiaomi store for the buyer’s country rather than inferred from China launch coverage.
Quick Recap
Best Value
- 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.
Water, fit and regional considerations
- Water use: Both are rated 5ATM. Xiaomi’s product specifications say that rating is suitable for shallow-water activity, not diving, hot showers or saunas. “Water-resistant” is more accurate than “waterproof.”
- Wrist size: The standard Watch S4 is 47.3mm across and approximately 44.5g without its strap. Do not confuse it with the distinct later Watch S4 41mm model.
- iPhone use: Both list iOS compatibility, but a compatibility listing does not guarantee that every feature or Xiaomi ecosystem integration will match the experience on a Xiaomi Android phone.
- Market differences: Prices, colors, NFC and software features can differ by country. A live global product page alone does not establish availability in every market.
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.
