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Mobile / Smartwatches

Xiaomi Watch S4
Case size
47.3mm
Platform
Proprietary
Display type
OLED
Battery life
360h

83 of 150 fields known.

All specs

SourceCalculated

General

Announced
29 October 20247Spec databasegsmarena.com/xiaomi_watch_s4-13476.phpRead 15 October 2026Spec page: announced and released 29 October 2024 in China. The global model followed in March 2025.
Predecessor
Not available
Successor
Xiaomi Watch S5 46mm15Reviewgsmarena.com/xiaomi_unveils_smart_band_10_pro_buds_6_sound_play_speaker-news-73032.phpRead 23 October 2026GSMArena says the Xiaomi Watch S5 comes as the successor to the Watch S4.
Launch price (US)
Not available
OS updates promised
Not available

Case

Front and side, drawn to scale.

Case size
47.3mm1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026The maker states 47.3 mm x 47.3 mm x 12.0 mm. The separate 41 mm Watch S4 has its own page and is not included.
Case material
Aluminium1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Aluminum alloy frame. The bezel is stainless steel according to the support FAQ.3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q2: middle frame entirely aluminium alloy, bezel stainless steel.
Back
Not available
Weight with strap
Not available

Durability

Water resistance standard
Not available
Dust and water rating
Not available
Dive rating
Not available
Max dive depth
Not available
MIL-STD-810
Not available
MIL-STD-810 tests
Not available
Operating temperature
Min-10Max45°C9Retailer pageteamplush.by/enRead 15 October 2026Same reseller copy of the manual: working temperature -10 to 45 C.

Display

Screen size
1.43in(3.6 cm)1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 20261.43-inch AMOLED display, 466 x 466 pixels.
Pixel density
326ppi1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Published PPI 326.
Display area
Not available
Min refresh rate
Not available
Peak brightness
2,200nits1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Peak 2200 nits is when only part of the screen lights up. HBM 1500 nits is the full-screen maximum. No reviewer measurement is substituted.
Minimum brightness
Not available

Platform

Software
Not available
Latest OS
Not available
App store
Not available
Voice assistants
Not available
Chipset
Not available
Process
Not available
CPU cores
Not available
CPU configuration
Not available
Max CPU clock
Not available
GPU
Not available
Low-power coprocessor
Not available

Memory

We could not find any of these 2 fields. Show them
RAM
Not available
Storage
Not available

Health sensors

ECG capability
Not available
Blood oxygen sensing
Yes1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026
Skin temperature sensing
Not available
Blood pressure feature
Not available
Body composition sensor
Not available
Skin conductance (EDA)
Not available
Medical clearances
Not available

Motion and environment sensors

Accelerometer range
Not available
Depth gauge
Not available
Depth gauge range
Not available
Water temperature sensor
Not available

Health and fitness

Sport profiles
Not available
Dive modes
Not available
External sensors
Not available

Safety

We could not find any of these 6 fields. Show them
Fall detection
Not available
Car crash detection
Not available
Emergency SOS
Not available
Emergency siren
Not available
Live location sharing
Not available
Dedicated LED flashlight
Not available

Positioning

Dual-band GNSS
Yes2Maker product pagemi.com/global/product/xiaomi-watch-s4Read 15 October 2026Overview: L1+L5 dual-frequency GNSS of five satellite positioning systems from an independent chip.
Offline maps
Not available

Connectivity

Bluetooth
Yes1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026
Wi-Fi
No7Spec databasegsmarena.com/xiaomi_watch_s4-13476.phpRead 15 October 2026WLAN: No.9Retailer pageteamplush.by/enRead 15 October 2026The copied radio table lists only GNSS, Bluetooth and NFC, with no Wi-Fi radio.
Wi-Fi standard
Not available
Wi-Fi bands
Not available
Network
Not available
4G bands
Not available
5G bands
Not available
Ultra-wideband
Not available
Satellite
Not available
ANT+
Not available

Audio

Calls on the watch
Phone only1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Bluetooth calling: Supported while the watch stays connected to the phone's Bluetooth. Voice calls from third-party apps are not supported.

Controls

Buttons
13Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q2: the 2 o'clock position has the function button and rotating crown. The 4 o'clock position has the power button. The crown is counted only in Crown.
Named operating buttons
Power button (4 o'clock)3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q2: power button at 4 o'clock.

Battery and charging

Battery capacity
486mAh1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Capacity 486 mAh. Rated or typical is not stated.
Claimed battery life
ModeWith solarHours (h)
SmartwatchNo360
Always-onNo120
Smartwatch mode (claimed)
360h
AOD battery life (up to)
120h
GPS mode (claimed)
Not available
Solar charging
Not available
Charging method
Magnetic pins1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Charging port: 2-pin magnetic charging dock.
Charging guidance
2-pin magnetic charging dock with a USB-A cable. The FAQ asks for a USB-A charger with 5 V output and at least 0.5 A.1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026The support FAQ gives the supply requirement.3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Charging Q2: USB-A charger with 5 V and at least 0.5 A output.
Max charging power (watch)
Not available
Fast charging
Yes2Maker product pagemi.com/global/product/xiaomi-watch-s4Read 15 October 2026Overview headline: 5 minutes of fast charging delivers 2 days of usage.
Charge 0 to 80% (claimed)
Not available
Full charge time (claimed)
60min3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Charging Q1 and Q2: about 60 minutes to fully charge.

Measured

Peak brightness (measured)
Not available
Battery life (measured)
Not available
Full charge time (measured)
Not available

Strap

Lug width
22mm3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q7: strap width 22 mm.
Quick-release strap
Yes3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q6: the watch supports quick-release straps released through the spring bar.
Strap system
22 mm quick-release straps with spring bars3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q6 and Q7: quick-release spring-bar straps, any 22 mm strap.
Strap material
Fluoroelastomer3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Spec page names fluororubber straps for Black and Silver. Fluororubber is stored as fluoroelastomer.
Strap sizes
SizeWrist (min) (mm)Wrist (max) (mm)
Black fluororubber strap140210

Regulatory

FCC ID
Not available
SAR limb (US)
Not available
SAR limb (EU)
0.232W/kg9Retailer pageteamplush.by/enRead 15 October 2026Same reseller copy: maximum SAR on the wrist 0.232 W/kg with no gap, against a 4.0 W/kg wrist limit averaged over 10 g, under the EU declaration. The near-mouth value of 0.132 W/kg is a body value and is not stored.

In the box

In the box
Xiaomi Watch S4 (including bezel and strap), Magnetic charging dock, User manual (including warranty notice)1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Package contents row.
Power adapter in box
No1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Package contents list only the watch, magnetic charging dock and manual. No power adapter.

Warranty

We could not find any of these 1 fields. Show them
Manufacturer warranty (source market)
Not available

Compare with

Pick a smartwatch to see both side by side. Differences are marked yellow.

More smartwatch comparisons

Variants

Each variant lists only what differs from the specs above.

Model numberGTINLaunch price (EU)ColoursStrap materialStrapStrap sizes
BHR9195GL6941812732403€159.99BlackSame as baseSame as baseSame as base
BHR9197GL6941812707432Not availableSilverSame as baseSame as baseSame as base
BHR9199GL6941812711668Not availableRainbowOtherFluororubber strap and nylon strap
Show 1 rows
SizeWrist (min) (mm)Wrist (max) (mm)
Rainbow fluororubber and nylon straps135210

Sources

We read 15 sources for this smartwatch. The numbers match the markers in the sheet.

  1. Read 15 October 2026Backs 39 fields
  2. Read 15 October 2026Backs 13 fields
  3. Read 15 October 2026Backs 29 fields
  4. Read 15 October 2026Backs 2 fields
  5. Read 15 October 2026Backs 1 field
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  7. Read 15 October 2026Backs 6 fields
  8. Read 15 October 2026Backs 1 field
  9. Retailer pageteamplush.by/en
    Read 15 October 2026Backs 6 fields
  10. Read 15 October 2026Backs 3 fields
  11. Read 15 October 2026Backs 3 fields
  12. Read 15 October 2026Backs 1 field
  13. Read 15 October 2026Backs 2 fields
  14. Read 15 October 2026Backs 2 fields
  15. Read 23 October 2026Backs 1 field

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