Smartwatches / Compare

Xiaomi Watch S4 vs Xiaomi Watch S5 46mm

A

Product A: Xiaomi

Watch S4

83 of 150 known

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B

Product B: Xiaomi

Watch S5 46mm

89 of 150 known

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Every value links to where we found it.

Only differences

AXiaomi Watch S4

BXiaomi Watch S5 46mm

General

5 of 10 differ

Series

Watch S3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q4 compares the Watch S4 with its predecessor, the Xiaomi Watch S3, in the same Watch S line.

Watch S3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Overview Q3 compares the Watch S5 46mm with the Watch S4 in the same Watch S line.

Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

M2425W1, BHR9195GL, BHR9197GL, BHR9199GL4Maker spec sheet (PDF)i02.appmifile.com/229_operatorx_operatorx_xm/29/08/2026/0506b1d933bea38854867532d7b1e253.pdfRead 15 October 2026EU Declaration of Conformity for radio equipment model M2425W1, Smart Watch, listed on Xiaomi's declaration page as Xiaomi Watch S4. The 41 mm Watch S4 is M2502W1 and is a separate product. The standards list covers Bluetooth, NFC and GNSS and has no cellular standard.6Maker product pagemi.com/global/service/support/declaration.htmlRead 15 October 2026Declaration page lists Xiaomi Watch S4 M2425W1 with EU DoC and PSTI documents, separate from Watch S4 41mm M2502W1.7Spec databasegsmarena.com/xiaomi_watch_s4-13476.phpRead 15 October 2026Spec page lists models M2424W1 and M2425W1. Only M2425W1 is documented for the global model, so M2424W1 is not stored.11Retailer pageeuronics.ee/en/phones/watches/smart-watches/bhr9195gl/xiaomi-watch-s4-black-smart-watchRead 15 October 2026Retailer product code BHR9195GL for the black Xiaomi Watch S4, 44.5 g, 486 mAh, Bluetooth 5.3, 4G No.13Retailer pagepood.datafox.ee/xiaomi-watch-s4-rainbow-smart-watchRead 15 October 2026Rainbow product code BHR9199GL.14Retailer pageachatmoinscher.com/comparateur-de-prix-Montre-connectee-sportive/montre-intelligente-xiaomi-s4-bhr9197gl-gris-argente-6941812707432.htmlRead 15 October 2026Silver product code BHR9197GL.

M2530W1, BHR08IVGL, BHR08ISGL, BHR08ITGL, BHR08IXGL4Maker spec sheet (PDF)i02.appmifile.com/257_operatorx_operatorx_xm/29/08/2026/b4c07745b195e649523c370b72bc9ae7.pdfRead 20 October 2026EU Declaration of Conformity for radio equipment model M2530W1, Smart Watch, dated 29 August 2026. The declaration page names it Xiaomi Watch S5 46mm.11Retailer pageammancart.com/products/smartwatch-xiaomi-s5-46mm-silver-bhr08isglRead 20 October 2026Silver: part number BHR08ISGL. Two retailer part numbers in the job brief point to the black version, but retailers list BHR08ISGL as Silver and BHR08IVGL as Black.12Retailer pagemsystems.gr/smart-watches/xiaomi-watch-s5-46mm-black-bhr08ivglRead 20 October 2026Black: part number BHR08IVGL.13Retailer pageofficespot.gr/shop/all-categories/wearables/smartwatches/xiaomi-watch-s5-46mm-blue-bhr08itglRead 20 October 2026Ceramic Blue: part number BHR08ITGL.14Retailer pagebatna24.com/de/p/smartwatches-und-sportarmbander/xiaomi-watch-s5-46mm-jungle-green-bhr08ixgl-70278-m2530w1Read 20 October 2026Jungle Green: part number BHR08IXGL from the product code in the page address. The page ties it to model M2530W1. Other retailers list BHR08IXGL for Jungle Green.

GTIN / EAN

6941812732403, 6941812707432, 694181271166812Retailer pagepood.datafox.ee/xiaomi-s4-smartwatch-blackRead 15 October 2026Black BHR9195GL, EAN 6941812732403.13Retailer pagepood.datafox.ee/xiaomi-watch-s4-rainbow-smart-watchRead 15 October 2026Rainbow BHR9199GL, EAN 6941812711668.14Retailer pageachatmoinscher.com/comparateur-de-prix-Montre-connectee-sportive/montre-intelligente-xiaomi-s4-bhr9197gl-gris-argente-6941812707432.htmlRead 15 October 2026Silver BHR9197GL, EAN 6941812707432.

6932554463397, 6932554463366, 6932554463373, 693255446341011Retailer pageammancart.com/products/smartwatch-xiaomi-s5-46mm-silver-bhr08isglRead 20 October 2026Silver EAN 6932554463366.12Retailer pagemsystems.gr/smart-watches/xiaomi-watch-s5-46mm-black-bhr08ivglRead 20 October 2026Black EAN 6932554463397.13Retailer pageofficespot.gr/shop/all-categories/wearables/smartwatches/xiaomi-watch-s5-46mm-blue-bhr08itglRead 20 October 2026Ceramic Blue EAN 6932554463373.14Retailer pagebatna24.com/de/p/smartwatches-und-sportarmbander/xiaomi-watch-s5-46mm-jungle-green-bhr08ixgl-70278-m2530w1Read 20 October 2026Jungle Green EAN 6932554463410.

AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

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.

28 May 20269Press articlefonearena.com/blog/483795/xiaomi-watch-s5-price-features.htmlRead 20 October 2026Article dated 28 May 2026 with the same euro and pound prices as Gizmochina. The USD figures in the article are conversions and are not stored.

Status

Available2Maker product pagemi.com/global/product/xiaomi-watch-s4Read 15 October 2026The global product page is live with specs and a buy link. GSMArena lists it as available.

Available2Maker product pagemi.com/global/product/xiaomi-watch-s5-46mmRead 20 October 2026The global product page is live with specs. Trade press says it is available now from 28 May 2026.

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

Not available

Xiaomi Watch S416Reviewgsmarena.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.

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

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.

Not available

Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

Not available

Not available

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

€159.9910Press articlefonearena.com/blog/447624/xiaomi-buds-5-pro-watch-s4-electric-scooter-5-max-price-global.htmlRead 15 October 2026Price 159.99 euros for the Watch S4. The article lists no colours and gives no tax treatment. Retail listings put the Rainbow edition at 169.99 euros, which is not a launch price and is not stored.

€179.998Press articlegizmochina.com/2026/05/28/xiaomi-watch-s5-46mm-globally-launched-specs-priceRead 20 October 2026Launch report of 28 May 2026: Black and Silver 179.99 EUR and 149.99 GBP, Jungle Green and Ceramic Blue 199.99 EUR and 169.99 GBP. Euro price with VAT as published. The Xiaomi pages show no price and the country behind the euro price is not named.

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

EU10Press articlefonearena.com/blog/447624/xiaomi-buds-5-pro-watch-s4-electric-scooter-5-max-price-global.htmlRead 15 October 2026Euro price from European announcement coverage. The global launch was at MWC 2025.

EU, GB8Press articlegizmochina.com/2026/05/28/xiaomi-watch-s5-46mm-globally-launched-specs-priceRead 20 October 2026Prices are given in euros and pounds. Xiaomi has no official US release.

ColoursiThe maker's own colour names

Black, Silver, Rainbow1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Silver, Rainbow and Black.

Black, Silver, Ceramic Blue, Jungle Green1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Four colours: Black, Silver, Ceramic Blue and Jungle Green.

Segment

Smartwatch2Maker product pagemi.com/global/product/xiaomi-watch-s4Read 15 October 2026The page sits under Wearables as the Xiaomi Watch S4 smartwatch with a rotating crown and 150+ sports modes.

Smartwatch3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Overview Q2: product positioning is a Xiaomi series long battery life smartwatch.

OS updates promisediYears of explicitly promised OS updates. A security-only support period does not establish an OS-upgrade promise.

Not available

Not available

Security updates untiliExact end date published for security-update support of this model. Do not calculate it from a stated number of years. A security-only period does not promise OS upgrades.

2 March 20275Maker spec sheet (PDF)i02.appmifile.com/791_operatorx_operatorx_xm/05/03/2026/e12c7be544083cc45f26f933fa49ae28.pdfRead 15 October 2026UK PSTI statement for M2425W1 dated 2025/2/6: the defined support period is until 3/2/2027. Xiaomi's other PSTI statements use month/day/year, such as 11/15/2026 and 2/27/2028, so this reads as 2 March 2027. This is a security-support period, not an OS-upgrade promise.

May 20285Maker spec sheet (PDF)i02.appmifile.com/127_operatorx_operatorx_xm/17/07/2026/fbc4923c53bffffff7fc441114771351.pdfRead 20 October 2026UK PSTI statement for M2530W1: the defined support period is until 05/2028. Read as May 2028. This is a security-support period, not an OS-upgrade promise.

Case

5 of 8 differ

Case sizeiMarketed case-size options. The marketed size can differ from physical case height, such as ceramic editions. Base dimensions describe the smallest base-material case.

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.

46mm1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 202646 mm body. The separate 41 mm Watch S5 has its own product and is not included.

Case shape

Round3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q2: round AMOLED display and 47.3 mm diameter.

Round3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Screen: 1.48-inch AMOLED circular screen.

Case materialiMaterial of the housing body, not just the bezel. Use Mixed when the maker describes a mixture of housing/frame materials. Read the published-material field for the parts and proportions.

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.

Stainless steel1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Frame row: watch body stainless steel. The bezel is stainless steel, ceramic or forged carbon by version.

Case material (as published)

Aluminium alloy middle frame with PVD coating and stainless steel bezel3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q2 and the S3 comparison: aluminium alloy with PVD coating, stainless steel bezel.

316L stainless steel frame with stainless steel bezel3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Body Q3: the middle frame is stainless steel and the bezel is stainless steel, ceramic or forged carbon. The overview page says the watch is crafted from 316L stainless steel.

BackiMaterial of the back of the smallest base-material case. Other materials or regional editions can differ. See source notes.

Not available

Not available

Case dimensionsiPhysical case height, width and thickness. The source note states exclusions such as the heart-rate sensor protrusion.

Height47.3Width47.3Thickness12mm(1.9 × 1.9 × 0.5 in)1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 202647.3 x 47.3 x 12.0 mm. The maker excludes the strap and protrusions. The FAQ gives 14.13 mm thickness with the heart rate bump.3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q2: diameter 47.3 mm, thickness 12 mm excluding the deco and heart rate sensor.

Height46Width46Thickness10.99mm(1.8 × 1.8 × 0.4 in)1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Dimensions 46.00 x 46.00 x 10.99 mm. The maker excludes the strap and protrusions. The FAQ gives 13.14 mm with the heart rate sensor protrusion.3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Body Q1: diameter 46 mm excluding DECO, thickness 10.99 mm excluding the heart rate sensor protrusion. 13.14 mm including it.

Weight (case only)iWatch body without a strap. An unqualified published weight must not be assumed to exclude the strap.

44.5g(1.6 oz)1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 202644.5 g approx., without the in-box strap.3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q2: 44.5 +/- 1 g, excluding the strap.

45.6g(1.6 oz)3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Body Q1: Black 45.6 g, Silver 45.3 g, Ceramic Blue 45.7 g and forged carbon Jungle Green 43.5 g. The specs page says about 46 g without the in-box strap. The FAQ does not say whether the strap is included, so the specs page wording is taken to apply.

Weight with strapiWatch with the stated strap attached. Strap material and case size belong in the source note. Reviewer measurements belong in measured fields.

Not available

Not available

Durability

0 of 8 differ

Water resistanceiStatic water-pressure rating in atmospheres. It is not a safe swimming or diving depth. Diving limits are listed separately.

5ATM1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 20265 ATM, described as 50 m static pressure. The maker says it is not suitable for hot showers, saunas or diving.3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q9: 5 ATM, equivalent to 50 m, for pool and shallow-water use and not for diving.

5ATM1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 20265ATM, equivalent to 50 m. The maker says it is not suitable for hot showers, saunas or diving.

Water resistance standard

Not available

Not available

Dust and water rating

Not available

Not available

Dive rating

Not available

Not available

Max dive depthiMaker-rated depth for the stated diving use, not a conversion from the water-resistance pressure rating.

Not available

Not available

MIL-STD-810iMaker claim that the watch was tested against specified MIL-STD-810 methods. It is not a guarantee for every military-standard test.

Not available

Not available

MIL-STD-810 tests

Not available

Not available

Operating temperatureiPublished operating range. Source notes identify on-wrist limits and other operating conditions. Storage or charging limits are excluded.

Min-10Max45°C9Retailer pageteamplush.by/enRead 15 October 2026Same reseller copy of the manual: working temperature -10 to 45 C.

Min-10Max45°C3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Charging and Battery Q1: operates from -10 to 45 C and charges from 1 to 45 C.

Display

6 of 14 differ

Display type

OLED1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Spec row: 1.43-inch AMOLED display. No LTPO is stated.

OLED1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 20261.48-inch AMOLED display. No LTPO is stated.

Display type (as published)

AMOLED1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Spec row: AMOLED display.

AMOLED1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026

Screen sizeiPublished active display diagonal for a rectangular display, or diameter for a round display. Do not calculate it from pixels or display area.

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.

1.48in(3.8 cm)1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026

Resolution

466 × 466px1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026

480 × 480px1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026

Pixel densityiPublished pixel density. A rectangular diagonal formula must not be applied to a round display.

326ppi1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Published PPI 326.

323ppi1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026

Display area

Not available

Not available

Touchscreen

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026

Yes3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Screen Q2 and Q3: swipe control and wet-touch protection. Underwater operation is not supported.

Max refresh rateiHighest published display refresh rate in active operation.

60Hz1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 202660 Hz refresh rate. The maker notes it may vary across interfaces.

Not available

Min refresh rateiLowest published display refresh rate, usually in always-on mode. It is not the active-use minimum unless stated.

Not available

Not available

Peak brightnessiMaker peak-brightness claim. It may apply to a small area or bright ambient light. Full-screen limits and battery/temperature conditions belong in source notes.

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.

2,500nits1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026HBM brightness 1500 nits and peak brightness 2500 nits. The maker says HBM is the highest brightness with the whole screen lit and peak is for a specific area. No reviewer measurement is substituted.

Minimum brightness

Not available

Not available

Always-on display

Yes2Maker product pagemi.com/global/product/xiaomi-watch-s4Read 15 October 2026Support FAQ has the AOD controls. The overview page announces colour always-on displays.3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q26: Always-on display supported, with Smart or Scheduled modes.

Yes2Maker product pagemi.com/global/product/xiaomi-watch-s5-46mmRead 20 October 2026Battery table gives a 9 day AOD scenario. The FAQ explains the AOD setting.3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Display Q4: Always-on display setting with a schedule. It reduces battery life.

Display cover

Other glass3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q2: Panda Glass cover. It is not a named Gorilla Glass or sapphire.

Other glass3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026

Display cover (as published)

Panda Glass3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q2: Panda Glass.

2D flat tempered high-aluminosilicate glass, 9H pencil hardness3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Screen Q1: 2D high-aluminosilicate glass with 9H pencil scratch hardness. Body Q3: 2D flat tempered glass cover. No brand is named.

Platform

4 of 15 differ

Platform

Proprietary1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Operating system: Xiaomi HyperOS 2, Xiaomi's own software. No Wear OS or other third-party watch platform is named.

Proprietary1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Operating system: Xiaomi HyperOS 3, Xiaomi's own software. No Wear OS or other third-party watch platform is named.

OS at launch

Xiaomi HyperOS 21Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026

Xiaomi HyperOS 31Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026

Software

Not available

Not available

Latest OS

Not available

Not available

Works with

Android, iOS1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Supports Android 8.0 and above, or iOS 14.0 and above.

Android, iOS1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Android 8.0 and above, or iOS 14.0 and above.

Phone requirement

Android 8.0 or later, or iOS 14.0 or later, with the Mi Fitness app1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026The Mi Fitness app is required for pairing according to the support FAQ.

Android 8.0 and above, or iOS 14.0 and above, with the Mi Fitness app3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Connect and Pair Q1: the watch needs the Mi Fitness app on iOS or Android.

App store

Not available

No3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Apps Q1: installing third-party apps is not supported.

Voice assistants

Not available

Not available

Chipset

Not available

BES2800BP3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026System Q1: processor BES2800BP with HyperOS, factory version 3.220.063.

Process

Not available

Not available

CPU cores

Not available

Not available

CPU configuration

Not available

Not available

Max CPU clock

Not available

Not available

GPU

Not available

Not available

Low-power coprocessor

Not available

Not available

Memory

1 of 2 differ

RAMiKeep published GB values as stated. Convert a source explicitly labelled MB using 1000 MB per GB and preserve its original figure and unit in the note. Do not assume MB means MiB. Convert explicit MiB or GiB to decimal GB through their byte definitions, recording the conversion in the note. This normalization does not establish an exact physical byte count.

Not available

Not available

StorageiTotal built-in storage the maker states, in decimal GB. Space available to the user is lower and goes in the source note. A figure the maker gives only as available space is not stored.

Not available

4GB3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026System Q7 says RAM 64 GB and ROM 4 GB. The RAM figure cannot be right for a watch and is not stored. The 4 GB ROM matches the Amazon US spec table.15Retailer pageamazon.com/dp/B08N64F336Read 20 October 2026Amazon US listing for the Black BHR08IVGL: memory storage capacity 4 GB. Listed by a marketplace seller. Xiaomi has no official US release.

Health sensors

4 of 8 differ

Heart rate sensor

Heart rate sensor (with blood oxygen sensor)1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Sensors row: heart rate sensor (with blood oxygen sensor). No sensor generation is named.

Four-LED, four-PD optical heart rate and blood oxygen sensor1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Sensors row: heart rate sensor with blood oxygen sensor. The overview page and FAQ name a four-LED, four-PD design.

ECG capabilityiElectrical heart sensing hardware with an ECG capability. The ECG app can require an eligible country, age and paired phone.

Not available

No3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Heart Q3: mobile ECG atrial fibrillation alerts are not supported. Gadgets and Wearables also lists ECG as No.10Spec databasegadgetsandwearables.com/technical-specs/xiaomi-watch-s5-46mmRead 20 October 2026Spec table: ECG No.

Blood oxygen sensingiBlood-oxygen sensing capability. App availability and medical status vary by market.

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026

Skin temperature sensingiA sensor or supported function that measures skin temperature. It is not a core-body thermometer.

Not available

No3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Body temperature Q1: body temperature measurement is not supported.10Spec databasegadgetsandwearables.com/technical-specs/xiaomi-watch-s5-46mmRead 20 October 2026Spec table: skin temperature No.

Blood pressure featureiPublished blood-pressure feature category. Hypertension notifications are not numerical blood-pressure readings.

Not available

None3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Support answers say blood pressure measurement is not supported.

Body composition sensor

Not available

Not available

Skin conductance (EDA)

Not available

Not available

Medical clearancesiNamed regulatory clearances and their jurisdiction. General water resistance or an ECG sensor does not establish medical clearance.

Not available

Not available

Motion and environment sensors

0 of 9 differ

Accelerometer

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026

Accelerometer range

Not available

Not available

Gyroscope

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026

Barometric altimeter

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026

Compass

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Sensors row lists an electronic compass.

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026

Ambient light sensor

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 20263Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Brightness Auto adjusts to ambient light.

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Sensors row lists an ambient light sensor.

Depth gauge

Not available

Not available

Depth gauge rangeiPublished measurement range of the depth gauge, distinct from maximum diving depth and water-pressure resistance.

Not available

Not available

Water temperature sensor

Not available

Not available

Health and fitness

3 of 5 differ

Health featuresiSupported health functions with country, phone and subscription restrictions in the source notes. Upcoming functions are not counted as available.

Continuous heart rate, Blood oxygen app, Sleep tracking, Sleep stages, Stress tracking, Cycle tracking2Maker product pagemi.com/global/product/xiaomi-watch-s4Read 15 October 2026Overview: heart rate, stress, blood oxygen and sleep monitoring, all-day options that need to be switched on. These are not medical features.3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Health pages: all-day heart rate, blood oxygen and stress, sleep stages (deep, light, REM, awake) and the Cycles app.

Continuous heart rate, Heart rate alerts, Blood oxygen app, Heart rate variability, Sleep tracking, Sleep stages, Stress tracking, Cycle tracking2Maker product pagemi.com/global/product/xiaomi-watch-s5-46mmRead 20 October 2026Overview: 24/7 heart rate, all-day blood oxygen, all-day stress, women's health cycle tracking and advanced sleep monitoring. These are not medical features.3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Heart, SpO2, stress, cycles and sleep answers: sustained high and low heart rate alerts, all-day SpO2 and stress, sleep HRV, sleep stages (deep, light, REM) and menstrual cycle tracking. Smart period prediction is not supported.

Fitness featuresiSupported workout functions. A sport-profile name alone does not prove advanced metrics such as running power or running dynamics. Trackback follows the recorded route back to the start. A compass arrow that points straight to the start does not count.

Automatic workout detection, VO2 max, Training load, Running dynamics, Pool swim, Open water swim2Maker product pagemi.com/global/product/xiaomi-watch-s4Read 15 October 2026Overview: running form recognition (vertical ratio, vertical amplitude, ground contact time) and 150+ sports modes.3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Workout Q1: auto detect for walking, running, cycling, rower, elliptical and jump rope. Q2 workout data: vertical stride ratio, vertical amplitude and ground contact time in running. 17 modes give pro data including pool and open water swimming. The Training State app manages training load.11Retailer pageeuronics.ee/en/phones/watches/smart-watches/bhr9195gl/xiaomi-watch-s4-black-smart-watchRead 15 October 2026Retailer spec tab lists maximal oxygen uptake (VO2 max) measurements as Yes.

Automatic workout detection, VO2 max, Training load, Running dynamics, Pool swim, Open water swim, Route navigation2Maker product pagemi.com/global/product/xiaomi-watch-s5-46mmRead 20 October 2026Overview: running form recognition (vertical ratio, vertical oscillation, ground contact time), 150+ sport modes and offline route navigation. Backtracking is described but not stored as trackback because the method is not stated.3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Workout answers: auto detect for running, cycling, rower, elliptical, jump rope and walking, fitness level and VO2 max, training load, wrist running form (vertical ratio, vertical amplitude, ground contact time) for outdoor and track running, pool swimming, open water and route navigation with Start navigation.

Sport profilesiPublished count of distinct sport/activity profiles. A claim such as 180+ is not an exact integer count.

Not available

Not available

Dive modesiActual supported dive modes. Water resistance or a depth app alone does not establish decompression-capable scuba support.

Not available

Not available

External sensorsiTypes of external workout sensors the watch can pair with. GPS reception, phone data and built-in sensors do not qualify.

Not available

Power meter2Maker product pagemi.com/global/product/xiaomi-watch-s5-46mmRead 20 October 2026Overview: Bluetooth power meters that use standard Bluetooth protocols are supported. Bluetooth heart rate broadcasting sends the watch's own rate to a bike computer.3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Workout Q6: only power meters that use standard Bluetooth protocols.

Safety

3 of 6 differ

Fall detectioniAutomatic fall detection. Incident detection restricted to recorded workouts is not counted as general fall detection.

Not available

Yes3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Security Q2: with Emergency SOS and Fall detection on, a serious fall followed by 60 seconds of inactivity dials the emergency contact and texts the location.

Car crash detection

Not available

Not available

Emergency SOSiA manual emergency alert to emergency services or preset contacts. Source notes identify the recipient, paired-phone requirement and country limits. Satellite is listed separately.

Not available

Yes3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Security Q1: press the power button three times to call the emergency contact and send your location. Up to 3 contacts. It needs the Mi Fitness app setup and a paired phone.

Emergency sireniPublished or measured siren sound level in decibels. Audible distance alone does not establish this value. Measurement distance belongs in source notes.

Not available

Not available

Live location sharingiShares live location during supported use. A paired phone or data subscription may be required.

Not available

Not available

Dedicated LED flashlightiA dedicated hardware LED flashlight. Lighting the display white is not counted.

Not available

No3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026The Control center flashlight turns the screen into a white light. There is no LED.

Positioning

2 of 3 differ

PositioningiPublished satellite systems and signal bands. Do not infer bands from dual-frequency support alone.

GPS (L1 + L5), Galileo (E1 + E5a), GLONASS (G1), BeiDou (B1I + B1C + B2a), QZSS (L1 + L5)1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Satellite systems: GPS, Galileo, Glonass, BeiDou and QZSS. The overview page says L1+L5 dual-frequency GNSS. The per-constellation bands come from the reseller copy of the manual regulatory table.7Spec databasegsmarena.com/xiaomi_watch_s4-13476.phpRead 15 October 2026Positioning: GPS (L1+L5), GLONASS, GALILEO, BDS, QZSS.9Retailer pageteamplush.by/enRead 15 October 2026Reseller page reproducing the M2425W1 manual regulatory table: GPS L1 / Galileo E1 / GLONASS G1 / BDS B1I, B1C / QZSS L1 at 1559-1610 MHz, and GPS L5 / Galileo E5a / BDS B2A / QZSS L5 at 1164-1215 MHz. This agrees with the maker's L1+L5 claim and GSMArena. Xiaomi's own manual PDF was not found, so the reseller copy is the source.

GPS, Galileo, GLONASS, BeiDou, QZSS1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026GPS, Galileo, Glonass, BeiDou and QZSS. The overview page says dual-band five-system GNSS.

Dual-band GNSSiMaker-stated dual-frequency satellite reception. Supported constellations and signal bands are listed separately.

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.

Yes2Maker product pagemi.com/global/product/xiaomi-watch-s5-46mmRead 20 October 2026Upgraded dual-band five-system GNSS with an all-new dual-frequency positioning chip.

Offline mapsiMap data stored on the watch and usable without live phone data. GPX routes or breadcrumb tracks alone are not offline maps.

Not available

Yes2Maker product pagemi.com/global/product/xiaomi-watch-s5-46mmRead 20 October 2026Full-colour offline maps with route navigation. Maps must be downloaded through the Mi Fitness app. Availability may vary by region.

Connectivity

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BluetoothiPublished Bluetooth support for this model. The version is recorded separately. Unknown version does not mean the radio is absent.

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026

Bluetooth version

5.31Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Wireless connectivity: Bluetooth 5.3.7Spec databasegsmarena.com/xiaomi_watch_s4-13476.phpRead 15 October 2026Bluetooth 5.3, A2DP, LE.9Retailer pageteamplush.by/enRead 15 October 2026The copied table lists Bluetooth 5.3 at 2400-2483.5 MHz.

5.41Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Dual-mode Bluetooth BLE/BT 5.4.

Wi-FiiPublished Wi-Fi support for this model. The standard and bands are recorded separately. Unknown standard does not mean Wi-Fi is absent.

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.

Yes3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Connectivity Q6: the watch can join Wi-Fi on its own. It cannot download apps. The Wi-Fi standard and bands are not stated.

Wi-Fi standard

Not available

Not available

Wi-Fi bands

Not available

Not available

CellulariTrue when a cellular edition is sold. A variant row states whether that individual model has cellular hardware.

No7Spec databasegsmarena.com/xiaomi_watch_s4-13476.phpRead 15 October 2026Versions: eSIM and NFC (China), Bluetooth and NFC (China), Bluetooth only (International). The global page and the EU declaration list no cellular radio, so the global model has no cellular.

No4Maker spec sheet (PDF)i02.appmifile.com/257_operatorx_operatorx_xm/29/08/2026/b4c07745b195e649523c370b72bc9ae7.pdfRead 20 October 2026The standards list covers Bluetooth and Wi-Fi 2.4 GHz, GNSS and NFC and has no cellular standard. GSMArena says only a separate eSIM model has cellular.

Network

Not available

Not available

4G bandsiPublished LTE bands for the stated regional cellular model. Do not transfer bands to another region or Wi-Fi-only model.

Not available

Not available

5G bandsiPublished 5G NR bands for the stated regional cellular model. RedCap support does not establish conventional full-bandwidth phone 5G.

Not available

Not available

NFCiSome regions sell an NFC edition, so it is per variant.

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026NFC: Supported. The maker says availability may vary by region.9Retailer pageteamplush.by/enRead 15 October 2026The copied regulatory table lists an NFC operating frequency of 13.56 MHz.

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026NFC supported. The maker says availability may vary by region.3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026NFC Q1: full hardware support. Services are limited at launch to Visa and Mastercard cards in Europe through Xiaomi Pay and EasyCard in Taiwan. More regions will follow by update.

Contactless payments

Yes2Maker product pagemi.com/global/product/xiaomi-watch-s4Read 15 October 2026NFC payment supports Mastercard and Visa terminals. Availability varies by region and issuing bank.

Yes2Maker product pagemi.com/global/product/xiaomi-watch-s5-46mmRead 20 October 2026NFC payments at Mastercard and Visa terminals. Availability varies by region.

Payment services

Xiaomi Pay3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026NFC related: bank cards are added through Mi Fitness, Device, Apps, Xiaomi Pay.

Xiaomi Pay3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026NFC answers: bank cards are added through Xiaomi Pay.

Ultra-wideband

Not available

Not available

Satellite

Not available

Not available

ANT+

Not available

Not available

Audio

1 of 4 differ

Speaker

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026

Yes1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Specs row: Speaker supported. The microphone is also listed as supported, with no count.3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Connectivity Q2: audio output switches back to the watch speaker.

Microphones

21Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Spec row: 2 mics.

Not available

Calls on the watchiVoice-call capability of the marketed model, including sold cellular editions. Variant radio capability and paired-phone requirements still apply.

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.

Phone only3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Calls Q3: answer, end and make calls on the watch over the paired phone's Bluetooth connection. Bluetooth earbuds cannot be used for calls.

Music on the watchiPlays audio stored on the watch. Remote control of phone playback or streaming alone does not qualify.

Yes3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q28: local music playback on the watch. An Android phone downloads the music. An iPhone cannot download songs, but songs already on the watch play.

Yes3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Music Q3: MP3 files are imported through the Mi Fitness app and played on the watch.

Controls

1 of 5 differ

ButtonsiPhysical controls used to operate the watch, excluding the rotating crown and strap-release buttons. A clickable rotating crown is counted only in Crown.

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.

13Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Body Q2 and Q3: the 4 o'clock power button is the only button. The 2 o'clock crown is counted only in Crown.

Named operating buttonsiNames of operating buttons, excluding the crown and strap-release controls.

Power button (4 o'clock)3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q2: power button at 4 o'clock.

Power button (4 o'clock)3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Body Q3: power button at 4 o'clock.

CrowniA crown that rotates to control the interface. A round push button that does not rotate is not a crown.

Rotating2Maker product pagemi.com/global/product/xiaomi-watch-s4Read 15 October 2026The overview describes a classic rotating crown.3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q2: stainless steel rotating crown that also works as a function button.

Rotating3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Body Q2: a rotating crown at 2 o'clock to navigate, press for the app list.

Rotating bezeliPhysical rotation or touch gestures around the display edge. A fixed decorative bezel is None.

None3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q11: the bezel is a removable decorative part that twists on for installation. The maker describes no bezel input.

None3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Bezel Q1: the bezel is fixed to the frame and cannot be replaced. The maker describes no bezel input.

Gestures

Raise to wake, Double-tap to wake, Wrist flip, Wrist shake, Finger snap, Fist clench2Maker product pagemi.com/global/product/xiaomi-watch-s4Read 15 October 2026Quick gestures and a classic rotating crown are listed. The support FAQ names the gestures.3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q24 lists wrist flip, wrist shake, finger snap and fist. Fist works only with HyperOS 2 phones. Raise to wake and double-tap to wake are in the display settings.

Raise to wake, Snap fingers, Shake wrist, Rotate wrist2Maker product pagemi.com/global/product/xiaomi-watch-s5-46mmRead 20 October 2026Overview: smart gesture recognition, wrist mode and quick gestures. The FAQ names the gestures.3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Raise to wake appears in the Control center. Quick gestures: snap fingers, shake wrist and rotate wrist.

Battery and charging

8 of 13 differ

Battery capacityiPublished battery capacity for the stated case size. Rated and typical capacity are distinguished in source notes.

486mAh1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Capacity 486 mAh. Rated or typical is not stated.

815mAh1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Capacity 815 mAh, lithium-ion polymer. Rated or typical is not stated.

Claimed battery lifeiMaker endurance claims with distinct operating modes and case sizes. With solar describes augmentation of that estimate, not hardware capability. Use false for ordinary claims without solar augmentation, true for explicitly solar-aided claims, and omit it when solar qualification is unclear. Source notes state AOD, GNSS, music and solar conditions. Do not create a normal-use row from an AOD-only claim. Low power denotes the maker battery-saver mode. Keep its typical, light-use and always-on claims separate from standard-mode claims. GPS power saving identifies an intermediate reduced-accuracy GNSS saving preset. Source notes retain the maker's preset name and published conditions. Max battery GPS is the distinct maximum-saving claim. When the maker has only one GPS saving preset, it is GPS power saving.

AXiaomi Watch S4

Mode	With solar	Hours (h)
Smartwatch	No	360
Always-on	No	120

Source2Maker product pagemi.com/global/product/xiaomi-watch-s4Read 15 October 2026Up to 15 days typical usage, tested by Xiaomi Internal Labs with factory defaults, AOD off, 100 messages a day, 200 wrist raises a day, 90 minutes of GNSS sports a week and 10-minute heart rate checks. The FAQ gives 14.5 days with an iPhone and 5 days with the Smart AOD option on. Days are converted exactly to hours.3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Charging and Battery Q1: typical 15 days (14.5 with an iPhone) and AOD 5 days, with the stated test conditions.

BXiaomi Watch S5 46mm

Mode	With solar	Hours (h)
Smartwatch	No	336
Always-on	No	216
Light use	No	504

Source2Maker product pagemi.com/global/product/xiaomi-watch-s5-46mmRead 20 October 2026Up to 21 days in the light usage scenario, 14 days normal and 9 days with AOD, tested by Xiaomi Internal Labs. Days are converted exactly to hours. The FAQ gives the full test conditions.3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Charging Q4: up to 21 days in the maximum scenario with power-hungry monitoring off and no AOD, 14 days in the typical scenario and 9 days with AOD. Test conditions include 100 messages a day and 15 minutes of Bluetooth calls a week.

Smartwatch mode (claimed)iMaker normal-use smartwatch claim without solar. A watch with only an explicit AOD-mode claim has no value here. Workloads differ and source notes must be read.

360h=CalculatedFrom Claimed battery life

336h=CalculatedFrom Claimed battery life

AOD battery life (up to)iMaker claimed smartwatch endurance with the always-on display enabled and without solar, for the base case. Source notes preserve workload and case conditions. This is a claim, not a measured test or an AOD-off estimate.

120h=CalculatedFrom Claimed battery life

216h=CalculatedFrom Claimed battery life

GPS mode (claimed)iMaker regular GPS/GNSS activity claim without solar, for the base case. AOD, multi-band, music and power-saving conditions have separate rows when published.

Not available

Not available

Solar chargingiPublished solar charging hardware capability. An ordinary battery estimate without solar augmentation does not prove that the watch lacks solar charging hardware.

Not available

Not available

Charging methodiThe connection at the watch, not the cable end at the USB adapter. A proprietary inductive puck is not Qi unless interoperability is explicitly established.

Magnetic pins1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Charging port: 2-pin magnetic charging dock.

Magnetic pins1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Charging port: 2-pin magnetic charging dock.

Charging guidanceiPublished charging requirements, nominal estimates and compatibility guidance. Keep adapter ratings separate from power accepted by the watch.

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.

2-pin magnetic charging dock with a USB cable. Xiaomi gives 5 V and 2 A wired charging and asks for a USB-A adapter with 5 V and 2 A output. Wireless charging is not supported. Charging works from 1 to 45 C.3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Charging Q1, Q2, Q3 and Q9: 5 V and 2 A wired charging, USB-A adapter with 5 V and 2 A, no wireless charging, dock shared with Watch S2, S3 and S4.

Max charging power (watch)iPublished maximum charging power at the watch. Adapter rating or charger input power does not prove the power accepted by the watch.

Not available

Not available

Fast chargingiAn explicit fast-charging capability claim. A short charging time or high adapter wattage alone does not qualify.

Yes2Maker product pagemi.com/global/product/xiaomi-watch-s4Read 15 October 2026Overview headline: 5 minutes of fast charging delivers 2 days of usage.

Not available

Quick charge claimiMaker claim for usage from a short charge. Source notes identify the usage workload, such as normal use or sleep tracking.

Charge time5 minUse time48 h2Maker product pagemi.com/global/product/xiaomi-watch-s4Read 15 October 20265 minutes of charging for 2 days of usage. The FAQ says this follows the typical battery model, which is the typical-use workload.3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Charging Q1: 5 minutes of charging provides a 2-day boost under the typical battery model.

Not available

Charge 0 to 80% (claimed)iMaker claim for charging an empty battery to 80%. Charger and approximate qualifiers belong in source notes.

Not available

Not available

Full charge time (claimed)iMaker advertised nominal full-charge duration. Approximate or theoretical maker estimates are allowed, with their conditions in source notes. Partial-charge intervals do not qualify. Measured 0 to 100% tests have a separate field.

60min3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Charging Q1 and Q2: about 60 minutes to fully charge.

90min3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Charging Q4 and Q7: about 90 minutes to fully charge with the official dock and a 5 V and 2 A or higher adapter.

Measured

1 of 4 differ

Peak brightness (measured)iReviewer measurement. Source notes state screen area, mode and ambient light. A small-area peak claim cannot be replaced with a full-screen measurement.

Not available

Not available

Battery life (measured)iReviewer-observed mixed-use endurance. Source notes state case size, AOD, workout use and whether it was a complete discharge. Extrapolation from partial discharge is excluded.

Not available

Not available

Battery tests (measured)iReviewer-observed endurance, with case size and test settings in source notes. Partial-discharge projections are not stored as measured endurance.

AXiaomi Watch S4

Test	Hours (h)
Mixed use, always-on	48

Source8Reviewgsmarena.com/xiaomi_watch_s4_review-news-67715.phpRead 15 October 2026Reviewer used AOD, notifications, a one-hour daily workout and sleep tracking. The most was three days when the watch nearly died, and two days was a consistent result. Stored as about 48 hours. Firmware and display brightness are not stated.

BXiaomi Watch S5 46mm

Test	Hours (h)
Mixed use, display setting unspecified	360

Source7Reviewgsmarena.com/xiaomi_watch_s5_review-news-73952.phpRead 20 October 2026Review of 11 October 2026: 15 days of endurance from a single charge with raise-to-wake active, five workouts a week and daily sleep tracking. Display mode is not stated and AOD was not tested separately. Stored as 360 h. No full-discharge log is shown.

Full charge time (measured)iReviewer measurement from empty to full, not 0-80% or a charge from 5%. Source notes name the charger and case size.

Not available

Not available

Strap

2 of 6 differ

Lug widthiDistance between standard strap attachment lugs, not the decorative width of a proprietary strap. Unknown for custom connectors unless the maker publishes lug width.

22mm3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q7: strap width 22 mm.

22mm3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Strap Q6: 22 mm strap width.

Quick-release strapiThe supplied strap can be detached through its quick-release mechanism. Compatibility with quick-release replacement straps alone does not qualify.

Yes3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Q6: the watch supports quick-release straps released through the spring bar.

Yes3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Strap Q6, Q8 and Q9: the quick-release strap is removed with a slide lever.

Strap systemiPublished attachment system and compatible case sizes. Proprietary connectors are distinguished from standard spring bars.

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.

22 mm quick-release straps3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Strap Q6: compatible with watches that support 22 mm straps.

Strap materialiMaterial of the supplied strap for the stated package. Do not substitute material from another band sold separately.

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.

Fluoroelastomer1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Black: fluororubber strap. Fluororubber is stored as fluoroelastomer.3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Strap Q7: fluororubber for Black and Silver, leather for Ceramic Blue and fluororubber nylon braided for forged carbon Jungle Green. The Jungle Green strap fits no single enum option and is stored as other.

Strap

Fluororubber strap3Maker product pagemi.com/global/support/faq/details/KA-517264Read 15 October 2026Spec page strap rows for Black and Silver.

Black fluororubber strap1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Strap rows by colour. The Black version has a black fluororubber strap.3Maker product pagemi.com/global/support/faq/details/KA-703529Read 20 October 2026Strap Q6: black fluororubber, gray fluororubber, blue leather and green fluororubber nylon braided.

Strap sizesiPublished wrist-circumference range for the stated strap or case. Source notes distinguish an overall compatible wrist range from one supplied strap size.

AXiaomi Watch S4

Size	Wrist (min) (mm)	Wrist (max) (mm)
Black fluororubber strap	140	210

Source1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026The Black and Silver fluororubber straps have an adjustable length of 140-210 mm approx. The maker publishes strap length, stored as the wrist range. The Rainbow set with fluororubber and nylon straps is 135-210 mm.

BXiaomi Watch S5 46mm

Size	Wrist (min) (mm)	Wrist (max) (mm)
Black fluororubber strap	140	210

Source1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Black and Silver fluororubber straps have an adjustable length of about 140 to 210 mm. The maker publishes strap length, stored as the wrist range. Ceramic Blue leather and Jungle Green straps are about 135 to 205 mm.

Regulatory

1 of 3 differ

FCC ID

Not available

Not available

SAR limb (US)iPublished limb/wrist SAR for the stated base regional model under the US regime. Other case sizes or radio versions can differ. Head or body SAR is excluded.

Not available

Not available

SAR limb (EU)iPublished limb/wrist SAR for the stated base regional model under the EU regime. Other case sizes or radio versions can differ. Head or body SAR is excluded.

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.

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Other certifications

EU RED 2014/53/EU conformity, RoHS 2011/65/EU conformity4Maker spec sheet (PDF)i02.appmifile.com/229_operatorx_operatorx_xm/29/08/2026/0506b1d933bea38854867532d7b1e253.pdfRead 15 October 2026The declaration covers RE Directive 2014/53/EU and RoHS Directive 2011/65/EU.

EU RED 2014/53/EU conformity, RoHS 2011/65/EU conformity4Maker spec sheet (PDF)i02.appmifile.com/257_operatorx_operatorx_xm/29/08/2026/b4c07745b195e649523c370b72bc9ae7.pdfRead 20 October 2026The declaration covers RE Directive 2014/53/EU and RoHS Directive 2011/65/EU.

In the box

1 of 2 differ

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.

Xiaomi Watch S5 46mm, Magnetic charging dock, User manual (including warranty notice)1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Package contents: watch, magnetic charging dock, user manual with warranty notice.

Power adapter in boxiA mains/USB power adapter is supplied. A charging cable, inductive puck or charging dock alone does not count.

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.

No1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Package contents list no power adapter.

Links

Not compared

Product page

www.mi.com/global/product/xiaomi-watch-s42Maker product pagemi.com/global/product/xiaomi-watch-s4Read 15 October 2026

www.mi.com/global/product/xiaomi-watch-s5-46mm2Maker product pagemi.com/global/product/xiaomi-watch-s5-46mmRead 20 October 2026

Spec sheet

www.mi.com/global/product/xiaomi-watch-s4/specs1Maker product pagemi.com/global/product/xiaomi-watch-s4/specsRead 15 October 2026Global specs page. Base case and strap describe the Black version.

www.mi.com/global/product/xiaomi-watch-s5-46mm/specs1Maker product pagemi.com/global/product/xiaomi-watch-s5-46mm/specsRead 20 October 2026Global specs page. The base values describe the Black version with its black fluororubber strap.

Manual

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EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

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Warranty

None of 1 known

Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

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Both are also in the API. Back to all smartwatches.