Xiaomi Watch S4

Works with: iPhone and Android
Display: AMOLED, 1.43 in
Case sizes: 47.3 mm
Battery: 15 days
Water resistance: 5 ATM
Weight: 44.5 g

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Xiaomi Watch S4 at a glance

Battery

Around two weeks

Up to 15 days in smartwatch mode.
GPS

Multi-band GPS

No maps. Runs and rides without your phone.
Display

AMOLED, 1.43 in

1.43 in, up to 2,200 nits and always-on option.
Health

Heart, sleep and more

Measures blood oxygen.
Phone & smart

iPhone and Android

Payments and calls.
Build

5 ATM water rating

44.5 g.

Xiaomi Watch S4 full specifications

Overview

Brand	Xiaomi
Model	Watch S4
Versions	Black, Silver, Rainbow
Colours	Silver, Rainbow, Black

Platform & apps

Works with iPhone and Android phones.

Operating system	other
Works with	iPhone and Android
Minimum iOS	iOS 14
Minimum Android	Android 8

Display

A vivid, high-contrast screen that is easy to read indoors and out.

1.43 in, up to 2,200 nits and always-on option.

Display type	AMOLED
Screen size	1.43 in
Resolution	466 x 466
Pixel density	326 ppi
Peak brightness	2,200 nits
Colour display	Yes
Always-on display	Yes
Controls	touchscreen, crown

Design & durability

A 47.3 mm case weighing 44.5 g.

Rated 5 ATM: fine for swimming laps and showers.

Case sizes	47.3 mm
Dimensions	47.3 x 47.3 x 12 mm
Thickness	12 mm
Weight (case)	44.5 g
Case material	Aluminum alloy
Band material	Fluororubber
Fits wrists	140-210 mm
Water resistance	5 ATM

Battery

Around two weeks: up to 15 days in smartwatch mode.

Real battery life depends on screen brightness, notifications and workouts.

Battery (smartwatch mode)	15 days
All battery modes	Smartwatch: 15 days
Battery capacity	486 mAh
Charging	dock
Fast charging	5 minutes of fast charging delivers 2 days of usage

GPS & navigation

Built-in multi-band GPS for accurate tracks, even near tall buildings and trees.

GPS	Built-in
Multi-band GPS	Yes
Satellite systems	GPS, Galileo, GLONASS, BeiDou, QZSS

Health & sensors

Tracks heart rate around the clock, plus blood oxygen.

For sleep, it offers sleep stages.

Sensors	optical HR, SpO2, accelerometer, gyroscope, ambient light, compass, barometer
Heart-rate tracking	24/7
Blood oxygen (SpO2)	Yes
Sleep tracking	Sleep stages
Stress tracking	Yes

Safety

Detects hard falls and can call for help if you don't respond.

SOS works through your paired phone.

Emergency SOS	Via phone
Fall detection	Yes

Training

Tracks 150+ sports and activities.

It adds daily suggested workouts.

Sport profiles	150
Adaptive coaching	Yes
Running dynamics	Yes

Smart features

Smart extras include contactless payments and calls on the wrist.

Notifications	Yes
Calls on the watch	Yes
Speaker	Yes
Microphone	Yes
Contactless payments	Yes
Bluetooth	Bluetooth 5.3
Find my phone	Yes

Diving, golf & more

Specialist modes	ski

Specs compiled from Xiaomi's product pages and datasheets. Manufacturers revise hardware between versions, so check the version on the box. Spotted an error? Tell us.