Xiaomi Watch S4 41mm, Smartwatch,41mm case diameter, Ultra-lightweight 32g body,Menstrual cycle prediction,150+ sports modes, Safety guardian features, Xiaomi HyperOS 3

908 Items sold in last hour
(36 customer reviews)

Short Product Overview

The Xiaomi Watch S4 41mm is an ultra-lightweight (32g) smartwatch and fitness tracker running on Xiaomi HyperOS 3, perfect for health-conscious adults. It features advanced health monitoring, including high-precision menstrual cycle prediction, and reliable Safety Guardian features for instant emergency contact and location sharing.

  • Ultra-Light 32g Design: Enjoy maximum comfort with a sleek 41mm case and classic aesthetic, ideal for all-day wear and sleep tracking.
  • Advanced Health & Fitness: Track performance across 150+ sports modes and instantly monitor heart rate, stress, and blood oxygen levels.
  • High-Precision Cycle Tracking: Utilizes a cutting-edge 0.1°C temperature sensor for reliable, 24/7 skin temperature monitoring and accurate cycle prediction.
  • Safety Guardian Features: Activate one-tap emergency calling and precise location sharing with a simple triple-click crown button.

£163.79

In stock

In stock

Purchase this product now and earn 164 Points!

176 People watching this product now!
Manufacture Warranty
Fast & Secure Shipping​
Free 30-Day Returns
Authentic Branded Product​

Payment Methods:

Description

Xiaomi Watch S4 41mm Smartwatch: Ultra-Light Fitness Tracker with Advanced Health Monitoring & HyperOS 3

Elevate your lifestyle with the Xiaomi Watch S4 41mm Smartwatch, the ultimate wearable designed for health-conscious adults and fitness enthusiasts. Featuring an ultra-lightweight 32g body and a sleek 41mm case diameter, this watch offers all-day comfort without compromising on power. Seamlessly track your activity with over 150 dedicated sports modes and leverage advanced safety guardian features, including one-tap emergency calling and precise location sharing. Running on the dynamic Xiaomi HyperOS 3, the Watch S4 provides intuitive control and focused notifications. Its cutting-edge temperature sensor offers high-precision skin temperature monitoring for enhanced wellness insights, including powerful menstrual cycle prediction. Experience a blend of classic wristwatch aesthetics with modern, professional-grade technology in this essential daily companion.

Key Features

  • Ultra-Lightweight Design: 41mm case with an astonishing 32g body for maximum comfort during workouts and sleep.
  • 150+ Sports Modes: Comprehensive activity tracking for every kind of fitness routine.
  • Advanced Health Suite: One-tap health check monitors heart rate, blood oxygen, stress, and sleep duration instantly.
  • High-Precision Menstrual Cycle Prediction: Equipped with a 0.1°C temperature sensor for reliable 24/7 skin temperature tracking to accurately predict cycles.
  • Safety Guardian: Triple-click crown button activates emergency contact calling and precise location sharing instantly.
  • Xiaomi HyperOS 3: Enjoy focused notifications and prioritized alerts from system apps and Mi Home integration.
  • Classic Aesthetic: Stainless steel body and multifaceted-cut crown inspired by traditional wristwatch design.
  • Display & GPS: Features a bright 1.32-inch digital display. Note: This model does not include built-in GPS.

Important Information

  • Includes rechargeable battery (1 Lithium Ion battery required and included).
  • Package includes watch, charging cable, and user manual.
  • The operating system is Xiaomi HyperOS 3.0.
  • Connectivity is via Bluetooth.

Why Choose Think Assemble

  • Quality Assurance: We guarantee genuine, high-quality Xiaomi products delivered in original packaging.
  • Fast Shipping: Orders are processed quickly to ensure you receive your new smartwatch without delay.
  • Dedicated Support: Our customer service team is ready to assist with any product inquiries or support needs.
0/5 (0 Reviews)
0/5 (0 Reviews)

Specification

Overview

Weight 32 g
Dimensions 29.1 × 6.9 × 3.7 cm
Age range

‎Adult

Color

Size

‎one size

Style

‎S4 41mm

Compatible with

‎Smartphone

Display size

‎1.32 Inches

Display type

‎Digital

Shape

‎Round

Meter

Blood Oxygen

,

‎Heart rate

,

Sleep Duration

,

stress

Number of Items

‎1

Features

‎Activity Tracker

,

‎GPS

,

‎Multisport Tracker

,

Time Display

,

Touchscreen

Included components

‎watch,cable,user manual

Batteries included?

‎Yes

Brand

Manufacturer

‎ Xiaomi

Item model number ‏

‎M2502W1

Package dimensions

‎29.1 x 6.9 x 3.7 cm; 32 g

Batteries ‏

‎ 1 A batteries required. (included)

Date First Available ‏

24 Sept. 2025

Customer Reviews

4.7
36 reviews
26
9
0
0
0

36 reviews for Xiaomi Watch S4 41mm, Smartwatch,41mm case diameter, Ultra-lightweight 32g body,Menstrual cycle prediction,150+ sports modes, Safety guardian features, Xiaomi HyperOS 3

Clear filters
  1. thinkassemble.co.uk Customer


    Excellent item lots of features and synced perfectly with the 14t pro phone

  2. Aga Gromadzka


    Highly recommend!

  3. Vitalijus Jakubovskis


    The strap is a bit small. Maybe it’s for a woman’s hand. But the watch suits me perfectly, I’m happy.

  4. Harakui


    Size is perfect for smaller wrists lightweight, comfy, and looks a lot more premium than I expected. Amoled display is bright and sharp, even outdoors, and the stainless steel frame gives it a classy feel. Features wise it does pretty much everything I need: loads of sports modes, heart rate and sleep tracking, and the health stats seem accurate enough for daily use. The UI is smooth and easy to navigate, and battery life has been great it lasts a full week for me, which is much better than most smartwatches I’ve tried. For some reason I’m unable to add more than one photo my browser keeps freezing whenever I try to upload another one, and this happens to me sometimes. So only one photo included in my review. There are a couple of small downsides: GPS can be a bit slow to lock in busy areas, and the app ecosystem isn’t as big as the top brands. But honestly, for the price, it’s hard to complain. Overall, it’s a great value watch that looks good, feels good, and handles everyday fitness and notifications perfectly.

  5. scape0goat


    Very nice smart-watch to use every day.Stainless steel body, multifaceted-cut crown, minimalist lugs, inspired by classic wristwatch aesthetics. The metal version features a diamond-embedded crown for a touch of sparkle on the wrist.41mm compact case diameter, ultra-lightweight 32g body, 9.5mm slim profile.Equipped with 0.1°C high-precision temperature sensor for 24/7 skin temperature monitoring, leveraging temperature fluctuation patterns.Very easy to set up and the battery life is one of its best features. Since getting the watch, I’ve been using it all day every day – so that’s three and a half days of continuous use and there’s still 28% battery remaining ! That’s absolutely fantastic performance. Especially as the screen has been on full brightness at 60Hz and it’s a higher resolution screen too. The intterface is always smooth & the crown scroll works perfectly. I swapped my white leather strap for a manly dark brown leather easy fit strap. It’s supremely soft and perfectly made – a great match for the watch I think. It’s been taken from the retiring old smartwatch which is just a generic no-brand model. I’ve found the app and features on the old watch were just OK. Xiaomi have taken them and just perfected them to make thema joy to use. That extra 8 or 10 % performance increase from Xiaomi, plus the introduction ( for me ) of a bug-free, stutter free and smooth flowing experience is just what I was hoping for. That extra makes so much of a difference to the use and relationship wirAvailable in four styles & finishes for a very competitive price.

  6. Josh


    Pros:- Looks very smart and nice clean design- Easy to set up- The body temperature monitoring seems accurate- Great to keep an eye on your health with ease- Intuitive to use- Bright & Clear screen- Battery life seems on par with competitorsCons:- The wrist strap is on the smaller side so fits smaller wrists i.e. womens- The instructions are pretty uselessOverall, this is a premium smart watch that looks nice, and for a decent price.

  7. Stacy Newton


    This comes in a nice box with a fairly useless instruction book and charging cable.When you turn the watch on it pretty much installs itself to your phone if your phone is close and has Bluetooth turned on. A few prompts and presses and it will be paired and working. You will need a Xiaomi account to use it but it is all very simple to set up. When paired the watch offers you a quick tutorial to cover the basics.The watch looks very nice. It has a slim bezel, very good quality screen and decent strap. It’s very light and reasonably low profile although higher than a standard watch.The screen really is very nice and more or less as good as premium watches such as Garmin and Apple. It’s bright with a high resolution and good viewing angles. The touch screen is quick and responsive.The controls are via a button and a crown dial/button plus the touch screen. The physical controls are on the right hand side so people who like to wear their watch of their right wrist will probably struggle.It has 8 watch faces installed with a combination of sporty and classic looks. I’m not sure if you can get more faces but I couldn’t see a way of doing it through the app.As a smart watch it has reasonable functionality with all the basic things that you would expect like weather, music, calculator and payments. The problem is the Xiaomi eco system is very basic right now, hopefully this will improve over time.Music functionality is very basic. You can load your own music files onto it and listen with Bluetooth headsets but only 2Gb of storage is available. Offline versions of the music streaming services aren’t available directly on the watch but you could probably control them from the watch on your phone.Card payments can be set up on the watch for NFC payments but at the time of review Xiaomi pay didn’t support cards from any major UK card issuers. The watch can not use Google pay.For health tracking the watch has a decent heart rate sensor and sleep tracking.For sports the gps seems accurate and although the app is very basic you can link it to your Strava account and use that instead. Little if any customisation is available although I’ve not fully looked into this.Overall this is a very good watch and certainly better than the price would suggest. Because it uses the Xiaomi OS the software lets down the excellent hardware somewhat although this may improve over time. For me the main issue was not being able to set up card payments for my credit cards but music functions and lack of a proper app store are also letdowns.At the time of review this version was around £136 with a discount which is very good value when compared to the big brand watches. Different colours are different prices but the actual functionality is the same.

  8. バウム

    腕の太い男性は事前に確認を
    時計のバンドが細めなので、上品な雰囲気の反面、腕の太い男性だとちょっと華奢すぎるかもしれません。購入前に写真等を確認することをおすすめします。動作はキビキビして反応もよく、気分によって文字盤を変えられて楽しんでます。

  9. valentina

    Piccolino, funzionale ed elegante
    Bellissimo!Venivo da modelli precedenti, stessa marca ma più easy con cui mi sono trovata benissimo, sono stata affascinata dallo stile di questo.Invecchiando, lo schermo cosi piccino da qualche problema di lettura ma quello è un problema mio. Schermo nitido e app che gira benissimo.Registra bene le attività.Disattivando tutti i vari monitoraggi della salute e tenendo solo le notifiche e registrando un allenamento al giorno, la batteria dura 4 gg.Il modello sportivo ha una durata decisamente piu lunga ma io li alterno. Questo è meno da battaglia. Comunque si ricarica in un attimo e vi si deve rinunciare solo per poco.Unica nota negativa estetica : l’altezza di profilo. Abbastanza spartano…

  10. rajamohamed

    Good product
    Good design and new look

  11. Milli

    Super Verarbeitung & Akkulaufzeit – perfekt für schmale Handgelenke!
    Die Xiaomi Watch S4 41mm überzeugt mit hervorragender Verarbeitung aus Edelstahl und hochwertigem Leder-Look-Armband, das angenehm leicht (nur 32 g) am Handgelenk sitzt. Besonders toll ist das Preis-Leistungs-Verhältnis: Bis zu 8 Tage Akkulaufzeit bei normaler Nutzung und präzise Features wie SpO2-Messung und über 150 Sportmodi. Meine Frau ist total zufrieden, da sie bei ihrem dünnen, schmalen Handgelenk perfekt passt und nicht stört – endlich eine elegante Smartwatch ohne Klobigkeit. Die Mi Fitness App ist zwingend nötig für die Kopplung und Daten-Sync, läuft aber reibungslos auf Android/iOS. Absolut empfehlenswert!

  12. Andre Ricardo

    Tamanho excelente para pulso delgado de senhora
    É um bom relógio e elegante, com tamanho ideal para pulso fino de senhora.

  13. thinkassemble.co.uk Customer


    Excellent item lots of features and synced perfectly with the 14t pro phone

  14. Aga Gromadzka


    Highly recommend!

  15. Vitalijus Jakubovskis


    The strap is a bit small. Maybe it’s for a woman’s hand. But the watch suits me perfectly, I’m happy.

  16. Harakui


    Size is perfect for smaller wrists lightweight, comfy, and looks a lot more premium than I expected. Amoled display is bright and sharp, even outdoors, and the stainless steel frame gives it a classy feel. Features wise it does pretty much everything I need: loads of sports modes, heart rate and sleep tracking, and the health stats seem accurate enough for daily use. The UI is smooth and easy to navigate, and battery life has been great it lasts a full week for me, which is much better than most smartwatches I’ve tried. For some reason I’m unable to add more than one photo my browser keeps freezing whenever I try to upload another one, and this happens to me sometimes. So only one photo included in my review. There are a couple of small downsides: GPS can be a bit slow to lock in busy areas, and the app ecosystem isn’t as big as the top brands. But honestly, for the price, it’s hard to complain. Overall, it’s a great value watch that looks good, feels good, and handles everyday fitness and notifications perfectly.

  17. scape0goat


    Very nice smart-watch to use every day.Stainless steel body, multifaceted-cut crown, minimalist lugs, inspired by classic wristwatch aesthetics. The metal version features a diamond-embedded crown for a touch of sparkle on the wrist.41mm compact case diameter, ultra-lightweight 32g body, 9.5mm slim profile.Equipped with 0.1°C high-precision temperature sensor for 24/7 skin temperature monitoring, leveraging temperature fluctuation patterns.Very easy to set up and the battery life is one of its best features. Since getting the watch, I’ve been using it all day every day – so that’s three and a half days of continuous use and there’s still 28% battery remaining ! That’s absolutely fantastic performance. Especially as the screen has been on full brightness at 60Hz and it’s a higher resolution screen too. The intterface is always smooth & the crown scroll works perfectly. I swapped my white leather strap for a manly dark brown leather easy fit strap. It’s supremely soft and perfectly made – a great match for the watch I think. It’s been taken from the retiring old smartwatch which is just a generic no-brand model. I’ve found the app and features on the old watch were just OK. Xiaomi have taken them and just perfected them to make thema joy to use. That extra 8 or 10 % performance increase from Xiaomi, plus the introduction ( for me ) of a bug-free, stutter free and smooth flowing experience is just what I was hoping for. That extra makes so much of a difference to the use and relationship wirAvailable in four styles & finishes for a very competitive price.

  18. Josh


    Pros:- Looks very smart and nice clean design- Easy to set up- The body temperature monitoring seems accurate- Great to keep an eye on your health with ease- Intuitive to use- Bright & Clear screen- Battery life seems on par with competitorsCons:- The wrist strap is on the smaller side so fits smaller wrists i.e. womens- The instructions are pretty uselessOverall, this is a premium smart watch that looks nice, and for a decent price.

  19. Stacy Newton


    This comes in a nice box with a fairly useless instruction book and charging cable.When you turn the watch on it pretty much installs itself to your phone if your phone is close and has Bluetooth turned on. A few prompts and presses and it will be paired and working. You will need a Xiaomi account to use it but it is all very simple to set up. When paired the watch offers you a quick tutorial to cover the basics.The watch looks very nice. It has a slim bezel, very good quality screen and decent strap. It’s very light and reasonably low profile although higher than a standard watch.The screen really is very nice and more or less as good as premium watches such as Garmin and Apple. It’s bright with a high resolution and good viewing angles. The touch screen is quick and responsive.The controls are via a button and a crown dial/button plus the touch screen. The physical controls are on the right hand side so people who like to wear their watch of their right wrist will probably struggle.It has 8 watch faces installed with a combination of sporty and classic looks. I’m not sure if you can get more faces but I couldn’t see a way of doing it through the app.As a smart watch it has reasonable functionality with all the basic things that you would expect like weather, music, calculator and payments. The problem is the Xiaomi eco system is very basic right now, hopefully this will improve over time.Music functionality is very basic. You can load your own music files onto it and listen with Bluetooth headsets but only 2Gb of storage is available. Offline versions of the music streaming services aren’t available directly on the watch but you could probably control them from the watch on your phone.Card payments can be set up on the watch for NFC payments but at the time of review Xiaomi pay didn’t support cards from any major UK card issuers. The watch can not use Google pay.For health tracking the watch has a decent heart rate sensor and sleep tracking.For sports the gps seems accurate and although the app is very basic you can link it to your Strava account and use that instead. Little if any customisation is available although I’ve not fully looked into this.Overall this is a very good watch and certainly better than the price would suggest. Because it uses the Xiaomi OS the software lets down the excellent hardware somewhat although this may improve over time. For me the main issue was not being able to set up card payments for my credit cards but music functions and lack of a proper app store are also letdowns.At the time of review this version was around £136 with a discount which is very good value when compared to the big brand watches. Different colours are different prices but the actual functionality is the same.

  20. バウム

    腕の太い男性は事前に確認を
    時計のバンドが細めなので、上品な雰囲気の反面、腕の太い男性だとちょっと華奢すぎるかもしれません。購入前に写真等を確認することをおすすめします。動作はキビキビして反応もよく、気分によって文字盤を変えられて楽しんでます。

Only logged in customers who have purchased this product may leave a review.