Smartwatches / Compare

COROS PACE 4 Pro vs Polar Street X

A

Product A: COROS

PACE 4 Pro

90 of 150 known

Change COROS PACE 4 Pro

Compare the Polar Street X with

Search smartwatches

B

Product B: Polar

Street X

79 of 150 known

Change Polar Street X

Compare the COROS PACE 4 Pro with

Search smartwatches

All 150 fields

Every value links to where we found it.

Only differences

ACOROS PACE 4 Pro

BPolar Street X

General

5 of 10 differ

Series

PACE1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026The page is the COROS PACE 4 Pro product. COROS names the PACE line.

Street1Maker product pagepolar.com/en/street-xRead 15 October 2026Polar files it under Urban Sports Watches. The Polar guide calls the Pacer and Street watches one line.

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

WPACE4P-BLK-N, WPACE4P-BLK, WPACE4P-WHT, W3373Maker product pageshop.coros.com/products/coros-pace-4-proRead 14 October 2026COROS store product JSON lists three SKUs: WPACE4P-BLK-N, WPACE4P-BLK and WPACE4P-WHT. W337 is the regulatory model from the FCC filing.12Regulatory filingfccid.co/fcc/2BBGF-W337Read 14 October 2026The filing identifies the hardware model as W337.

6J, 900116713, 900116714, 9001167151Maker product pagepolar.com/en/street-xRead 15 October 2026Store feed SKUs 900116713 (Night Black), 900116714 (Forest Green) and 900116715 (Snow White). The manual and the regulatory sheet give the model 6J.3Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/technical-specifications.htmRead 15 October 2026Model 6J.

GTIN / EAN

810005786874, 810005786676, 8100057866833Maker product pageshop.coros.com/products/coros-pace-4-proRead 14 October 2026Variant barcodes: WPACE4P-BLK-N 810005786874, WPACE4P-BLK 810005786676, WPACE4P-WHT 810005786683.

725882070766, 725882070773, 7258820707801Maker product pagepolar.com/en/street-xRead 15 October 2026Store feed gtin12: 725882070766 Night Black, 725882070773 Forest Green and 725882070780 Snow White.

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

22 September 202614Reviewtomsguide.com/wellness/smartwatches/coros-pace-4-pro-reviewRead 14 October 2026The review says the PACE 4 Pro launched on 22 September 2026.

25 March 202617Press releasepolar.com/en/media-room/polar-debuts-street-xRead 15 October 2026Press release dated 25 March 2026 from Kempele, Finland.

Status

Available3Maker product pageshop.coros.com/products/coros-pace-4-proRead 14 October 2026All three variants are marked available on the US store. The product was published on 2026-09-22.

Available1Maker product pagepolar.com/en/street-xRead 15 October 2026Global store: Buy now and in stock for three colours.

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

Not available

Not available

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.

Not available

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.

$4493Maker product pageshop.coros.com/products/coros-pace-4-proRead 14 October 2026List price 449.00 USD on the US store for all three variants. US sales tax is not included.

$249.917Press releasepolar.com/en/media-room/polar-debuts-street-xRead 15 October 2026USD 249.90, excluding tax.

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.

€4494Maker product pagecoros.com/de/buy/pace4proRead 14 October 2026COROS Germany store lists 449.00 EUR for all three variants. EUR prices include VAT. This is the current list price three weeks after launch. BikeRadar's launch report gives the same 449 EUR.16Press articlebikeradar.com/news/coros-pace-4-pro-smartwatchRead 14 October 2026Launch report: 389 GBP / 449 USD / 449 EUR.

€249.917Press releasepolar.com/en/media-room/polar-debuts-street-xRead 15 October 2026EUR 249.90 including VAT where applicable. GBP 219.00.

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

US, DE3Maker product pageshop.coros.com/products/coros-pace-4-proRead 14 October 2026US store page. The German store page is the other source.

US, DE2Maker product pagepolar.com/us-en/street-xRead 15 October 2026The US store lists the same three colours as in stock. Its current price is 249.99 USD, which differs from the launch price of 249.90 USD and is not used.

ColoursiThe maker's own colour names

Black / Nylon, Black / Silicone, White / Silicone3Maker product pageshop.coros.com/products/coros-pace-4-proRead 14 October 2026Option names on the store, verbatim: Black / Silicone, White / Silicone, Black / Nylon.

Night Black, Snow White, Forest Green1Maker product pagepolar.com/en/street-xRead 15 October 2026Colour options: Night Black, Snow White, Forest Green.

Segment

Sport2Maker product pagecoros.com/pace4proRead 14 October 2026COROS calls it a GPS sport watch and a multisport watch with dedicated run, bike, swim, triathlon and multi-sport modes.

Sport1Maker product pagepolar.com/en/street-xRead 15 October 2026Polar calls it an urban sports watch for hybrid athletes who train, work and live in the city. The store lists it in the Performance Series.

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.

Not available

Not available

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.

47.6mm1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026COROS publishes no marketed case size. 47.6 mm is the stated length and width of the case.

45mm1Maker product pagepolar.com/en/street-xRead 15 October 2026One size. Tech specs: width 45 mm and height 45 mm.

Case shape

Round1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026The display is round and the case outline in the maker product images is round.

Round1Maker product pagepolar.com/en/street-xRead 15 October 2026Round case with a round AMOLED display.

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.

Fibre-reinforced polymer1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Materials: cover material Fiber Reinforced Polymer, bezel material Grade 5 Titanium Alloy. The overview and store copy also say TC4 titanium alloy, which is the same alloy as Grade 5. T3 and the5krunner describe a polymer body with a titanium bezel, so the housing is not classed as titanium.15Reviewt3.com/active/fitness-trackers/coros-pace-4-pro-reviewRead 14 October 2026The polymer case body feels a bit plasticky next to the titanium bezel and sapphire glass. This agrees with the maker's cover material and bezel material.

Fibre-reinforced polymer1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: case material and bezel material Bio-based plastic. The launch release says reinforced polymer body. The manual lists PA11+8GF (glass-fibre reinforced polyamide 11) among the device materials. Stored as fibre-reinforced polymer.3Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/technical-specifications.htmRead 15 October 2026Device materials list PA11+8GF, a glass-fibre reinforced polyamide.

Case material (as published)

Fiber Reinforced Polymer cover with Grade 5 Titanium Alloy bezel1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Materials > Cover Material and Bezel Material.

Bio-based plastic1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: Case material Bio-based plastic.

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.

Height47.6Width47.6Thickness11.8mm(1.9 × 1.9 × 0.5 in)1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Size and Weight > Dimensions 47.6 x 47.6 x 11.8 mm. Height does not include the optical heart rate sensor. The overview calls 11.8 mm the width, but the spec table and reviews treat it as thickness.

Height45Width45Thickness13.8mm(1.8 × 1.8 × 0.5 in)1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: width 45 mm, height 45 mm, thickness 13.8 mm.

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

38g(1.3 oz)1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026The overview comparison lists body weight 38 g for the PACE 4 Pro. The German page calls it Gehäusegewicht.2Maker product pagecoros.com/pace4proRead 14 October 2026PACE 4 Pro body weight 38 g in the comparison.

28g(1 oz)1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: total weight without wristband 28 g.18Maker product pagepolar.com/en/guide/polar-street-x-vs-polar-pacer-proRead 15 October 2026Comparison table: 48 g, 28 g without band.

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

43g(1.5 oz)1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Size and Weight: 43 g with nylon band, 51 g with silicone band. The base value is the nylon band. The silicone rows are in the variants.

48g(1.7 oz)1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: total weight 48 g. This is with the POLAR Street Wristband, 22mm that comes in the box.

Durability

2 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 pagecoros.com/pace4pro/specsRead 14 October 2026Durability > Water Resistance 5 ATM, suitable for surface water activities and not for diving.

5ATM1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: water resistance WR50. The manual says 50 m, suitable for swimming.3Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/technical-specifications.htmRead 15 October 2026Water resistance 50 m (suitable for swimming).

Water resistance standard

Not available

ISO 228103Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/technical-specifications.htmRead 15 October 2026The water resistance section says Polar tests to ISO 22810 or IEC 60529. The 20, 30 and 50 m class cites ISO 22810.

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

Yes1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: tested against military standard MIL-STD-810H. The tested methods are not listed.

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-20Max50°C1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Durability > Working Temperature -20 to 50 C. Storage -20 to 60 C is a separate range.

Min-20Max50°C1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: operation temperature -20 C to 50 C.3Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/technical-specifications.htmRead 15 October 2026Operating temperature -20 C to +50 C.

Display

10 of 14 differ

Display type

LTPO OLED1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026

OLED1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: display type AMOLED.

Display type (as published)

LTPO AMOLED Display1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Display > Display Type LTPO AMOLED Display.

AMOLED1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: display type AMOLED.

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

1.47in(3.7 cm)1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Display > Display Size 1.47 inches.

1.28in(3.3 cm)1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: display size 1.28 inch.

Resolution

466 × 466px1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026

416 × 416px1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: display resolution 416 x 416.

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

Not available

Not available

Display area

Not available

Not available

Touchscreen

Yes1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Display copy says 1.47 inch touchscreen display, and the setup guide has Touchscreen settings.

Yes1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: touch screen Yes.5Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/button-functions.htmRead 15 October 2026Color touch display: swipe and tap. It is disabled during training.

Max refresh rateiHighest published display refresh rate in active operation.

60Hz2Maker product pagecoros.com/pace4proRead 14 October 2026The adaptive refresh rate moves from 60Hz to 1Hz LTPO.

Not available

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

1Hz2Maker product pagecoros.com/pace4proRead 14 October 2026The same text gives 1Hz as the lowest rate. It is the LTPO idle rate.

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.

3,500nits2Maker product pagecoros.com/pace4proRead 14 October 2026Maker claim of a 3,500 nit AMOLED display. Auto-Brightness is described as from 3,500 nits at noon to 2 nits at 2AM. Window size and test conditions are not stated, so it is a claim and not a measurement.

Not available

Minimum brightness

2nits2Maker product pagecoros.com/pace4proRead 14 October 2026Auto-Brightness range ends at 2 nits at 2AM.

Not available

Always-on display

Yes5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026Display > Always On keeps the screen illuminated and dims it when the wrist is lowered.

Yes1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: always on display Yes. The battery support page says it is off by default.14Maker product pagesupport.polar.com/en/what-is-the-battery-life-of-street-xRead 15 October 2026Always on display is off by default in Street X.

Display cover

Sapphire1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026

Gorilla Glass1Maker product pagepolar.com/en/street-xRead 15 October 2026Description: 1.28 inch AMOLED touchscreen with Gorilla Glass 3.

Display cover (as published)

Sapphire Glass1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Materials > Screen Material Sapphire Glass.

Corning Gorilla Glass 3 (AF + DLC coating)1Maker product pagepolar.com/en/street-xRead 15 October 2026Manual tech spec: Corning Gorilla Glass 3 (AF + DLC coating).3Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/technical-specifications.htmRead 15 October 2026Watch materials: Corning Gorilla Glass 3 (AF + DLC coating), PA11+8GF, aluminum, stainless steel, PMMA. Wristband: silicone with an aluminum buckle.

Platform

6 of 15 differ

Platform

Proprietary8Maker product pagesupport.coros.com/hc/en-us/articles/53824831742100-COROS-PACE-4-Pro-Release-NotesRead 14 October 2026COROS publishes its own firmware versions through the COROS app and Wi-Fi updates. Tom's Guide says there is no app store. No Wear OS, watchOS or HarmonyOS.

Proprietary1Maker product pagepolar.com/en/street-xRead 15 October 2026Polar own firmware. The Polar comparison guide says it runs the same OS as the Vantage V3 and Grit X2 Pro.

OS at launch

Not available

Not available

Software

Not available

Not available

Latest OS

V3.2008.08Maker product pagesupport.coros.com/hc/en-us/articles/53824831742100-COROS-PACE-4-Pro-Release-NotesRead 14 October 2026Latest published PACE 4 Pro firmware V3.2008.0, September 26 2026. The FCC test sample ran software V3.1706.0, which is not an OS-at-launch claim.

Not available

Works with

iOS, Android5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026Download the COROS app from the iOS or Google Play store.

iOS, Android15Maker product pagesupport.polar.com/ie-en/polar-flow-app-and-compatible-devicesRead 15 October 2026Street X works with iOS and Android phones through the Polar Flow app.

Phone requirement

Not available

iOS 17 or later, or Android 8 or later with Bluetooth 4.0 capability, running the Polar Flow app15Maker product pagesupport.polar.com/ie-en/polar-flow-app-and-compatible-devicesRead 15 October 2026Street X: iOS mobile devices with iOS 17 or later. Android mobile devices with Bluetooth 4.0 capability and Android 8 or later.

App store

No14Reviewtomsguide.com/wellness/smartwatches/coros-pace-4-pro-reviewRead 14 October 2026The smart features section says there is no app store. Syncing data to Strava or TrainingPeaks does not install third-party apps on the watch.

Not available

Voice assistants

Voice Control5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026Holding the Action button launches Voice Control for commands such as start a run or create a reminder. The list names the watch's own voice commands, not a third-party assistant.

Not available

Chipset

Not available

Not available

Process

Not available

Not available

CPU cores

Not available

Not available

CPU configuration

ACOROS PACE 4 Pro

Not available

BPolar Street X

Max clock (GHz)
0.275

Source1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: CPU speed 275 MHz. Core count and type are not stated.

Max CPU clock

Not available

0.275GHz=CalculatedFrom CPU configuration

GPU

Not available

Not available

Low-power coprocessor

Not available

Not available

Memory

2 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.

64 MB16Press articlebikeradar.com/news/coros-pace-4-pro-smartwatchRead 14 October 2026Relays COROS: double the RAM size of the PACE 4 at 64MB. The same sentence says 64GB storage, which conflicts with the maker's 32GB spec and is not used. Stored as 0.064 GB, 64 MB at 1000 MB per GB.17Retailer pageplaybetter.com/products/coros-pace-4-pro-multisport-gps-smartwatchRead 14 October 2026Spec list reads RAM 64MB (2x PACE 4), in agreement with BikeRadar.

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.

32GB1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Memory > Internal Memory 32GB, shared by music and maps. The support article Playing Music from Your COROS Watch still says 4GB for the PACE 4 Pro, which looks like an unchanged line from the PACE 4. The spec table, the buy page and reviews say 32GB.

32 MB1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: storage 32 MB, stored as 0.032 GB. The page also lists memory 5 MB, which is not labelled RAM and is not stored.

Health sensors

4 of 8 differ

Heart rate sensor

Optical heart rate monitor, multi-channel PPG1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Data Tracking lists an Optical Heart Rate Monitor, and the overview says the latest multi-channel PPG sensor. Tattoos may affect readings.

Polar Precision Prime optical heart rate sensor (OHR GEN 3.5)1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: Precision Prime, OHR GEN 3.5.3Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/technical-specifications.htmRead 15 October 2026Sensors: Precision Prime, Skin Temp GEN 1, OHR GEN 3.5.

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

Not available

No1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: ECG none.

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

Yes1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Data Tracking lists an Optical Pulse Oximeter.5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026Sensor list: Pulse oximetry sensor (new SpO2 sensor).

No1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: SpO2 none.

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

Not available

Yes1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: Skin Temp GEN 1. Nightly skin temperature feature.

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

Not available

Not available

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

1 of 9 differ

Accelerometer

Yes1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026

Yes1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: accelerometer Yes.

Accelerometer range

Not available

Not available

Gyroscope

Yes1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026

Yes1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: gyroscope Yes.

Barometric altimeter

Yes1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026

Yes1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: barometer Yes.

Compass

Yes1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026

Yes1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: magnetometer compass Yes.

Ambient light sensor

Not available

Yes1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: ambient light sensor Yes.

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.

Blood oxygen app, Heart rate variability, Sleep tracking, Sleep stages, Stress tracking, Cycle tracking1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Data Tracking > Daily Features lists Daily Stress, Sleep with REM tracking, HRV and Wellness Check. The setup guide describes sleep stages, overnight HRV, menstrual cycle tracking and the SpO2 oximeter. Resting heart rate is read every 10 minutes in daily use, so continuous heart rate is not stored. Tom's Guide says the watch has no readiness score.5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026Sleep and Wellness Features names sleep with a sleep score and stages, overnight HRV and menstrual cycle tracking. Daily Stress is a setting. The Oximeter control takes manual SpO2 readings.

Continuous heart rate, Heart rate variability, Sleep tracking, Sleep stages1Maker product pagepolar.com/en/street-xRead 15 October 2026Features: continuous heart rate, nightly sleep stages (Sleep Plus Stages), Nightly Recharge, SleepWise. HRV is listed under heart rate. The Daily Readiness card and SleepWise give an alertness forecast, not a readiness score, so readiness_score is not stored. No stress score is listed. Not a medical device.4Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/introduction.htmRead 15 October 2026Introduction: Sleep Plus Stages, Nightly Recharge, SleepWise, continuous heart rate.

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.

VO2 max, Training load, Recovery advice, Pool swim, Open water swim, Interval workouts, Route navigation, Turn-by-turn navigation, Trackback1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026EvoLab lists recovery, fatigue, training load and VO2 max. Basic Interval Training is named. Supported Activity Modes list Open Water and Pool Swim. Navigation lists Back-To-Start, and the setup guide describes Turn by Turn and Back to Start retracing your GPS track. Running dynamics need a COROS POD, so they are not stored.5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026Navigation Settings include Turn by Turn and Back to Start, which retraces your steps via your GPS track.

VO2 max, Training load, Recovery advice, Running power, Pool swim, Open water swim, Interval workouts, Route navigation, Turn-by-turn navigation, Trackback, Climb detection1Maker product pagepolar.com/en/street-xRead 15 October 2026Features and cards: Running Performance Test (VO2max), Training Load Pro, Recovery Pro, wrist-based running power, swimming metrics, interval timers and phased training targets, route guidance, turn-by-turn route guidance, Track Back, Back to Start. Hill Splitter detects uphills and downhills automatically (manual). The manual has separate pool and open water swimming sections.4Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/introduction.htmRead 15 October 2026Introduction: Route Guidance, Komoot routes, Track back, Back to start, Running Performance Test with VO2max, Walking test, Training Load Pro, Recovery Pro, running power, swimming metrics with distance and strokes also in open water, Hill Splitter.9Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/swimming-metrics.htmRead 15 October 2026Separate sections for pool swimming (distance, pace, strokes, SWOLF) and open water swimming (distance, pace, stroke rate for freestyle and route).10Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/hill-splitter.htmRead 15 October 2026Hill Splitter automatically detects all uphills and downhills from GPS speed, distance and barometric altitude. It needs a 1 second GPS recording rate. Stored as climb detection.13Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/track-back-and-back-to-start.htmRead 15 October 2026Track back guides you back to the start via the same route you came. Back to start shows the direction by beeline.

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.

Heart rate strap, Power meter, Speed and cadence, Foot pod1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026The buy page FAQ names heart rate monitors, cycling power meters, cadence sensors, speed sensors and the COROS POD 2 running dynamics pod, all over Bluetooth. No smart-trainer capability is stated.

Heart rate strap, Power meter, Speed and cadence8Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/compatible-sensors.htmRead 15 October 2026Compatible Bluetooth sensors: Polar Verity Sense, OH1, H10 and H9 heart rate sensors, Polar speed sensor and cadence sensor, and third-party power sensors.

Safety

3 of 6 differ

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

Not available

Not available

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.

Yes9Maker product pagesupport.coros.com/hc/en-us/articles/25514157012116-Safety-AlertsRead 14 October 2026The PACE 4 Pro spec page lists Safety Alerts under navigation features. This article, last edited 2026-06-23, lists the PACE 4 and PACE Pro but not the PACE 4 Pro, so it is used only for how the feature works. A manual Safety Alert sends location and a live tracking link by text to up to three preset contacts during outdoor activities, and it needs the paired phone with cell service. It does not contact local emergency services.

Not available

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.

Yes10Maker product pagesupport.coros.com/hc/en-us/articles/51716258730772-How-to-Use-Live-TrackingRead 14 October 2026Live Tracking works for outdoor activities and needs the phone connected with the COROS app running. The article, last edited 2026-08-14, does not list the PACE 4 Pro. Tom's Guide says the PACE 4 Pro can share a live tracking link, so the value rests on that review plus how the feature works.14Reviewtomsguide.com/wellness/smartwatches/coros-pace-4-pro-reviewRead 14 October 2026During activities you can share a live tracking link and send SOS alerts.

Not available

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

No5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026The Flashlight tool lights the screen white. It is not a dedicated hardware LED.

Yes1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: front LED light Yes. Built-in LED flashlight with red light mode.11Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/flashlight.htmRead 15 October 2026Integrated LED flashlight with adjustable white light and a red light mode.

Positioning

3 of 3 differ

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

GPS, GLONASS, Galileo, BeiDou, QZSS1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Geo Location > Satellite Systems lists GPS, GLONASS, Galileo, Beidou and QZSS. Signal bands per system are not listed.

GPS, Galileo, BeiDou, QZSS1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs, Geo location: GPS, Galileo, BeiDou and QZSS Yes. GLONASS is not listed.18Maker product pagepolar.com/en/guide/polar-street-x-vs-polar-pacer-proRead 15 October 2026Comparison table: GPS constellations GPS, Galileo, BeiDou, QZSS for Street X. GLONASS is not named.

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

Yes1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Geo Location > GNSS Chipset reads All-Satellite Dual-Frequency.2Maker product pagecoros.com/pace4proRead 14 October 2026Overview: dual-frequency GPS.

Not available

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

Yes1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Navigation lists downloadable Landscape and Topo global maps, and 32GB holds them.

No19Spec databasethe5krunner.com/specs/polar/street-xRead 15 October 2026No onboard maps. Route guidance uses planned routes and breadcrumbs.

Connectivity

4 of 15 differ

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

Yes1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Connectivity lists Bluetooth for accessories and phone. No Bluetooth version is published.

Yes1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: Bluetooth technology Bluetooth LE.

Bluetooth version

Not available

Not available

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

Yes1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Connectivity > Data Sync Wi-Fi / COROS App.5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026System > WiFi connects the watch to Wi-Fi to upload activities and download firmware.

No1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs, Connectivity lists Bluetooth LE and the USB cable only.

Wi-Fi standard

Wi-Fi 613Regulatory filingfccid.co/api/files/s2/fccids/2BBGF-W337/files/c1951110_SAR_Test_Report.pdfRead 14 October 2026Radio specification lists IEEE 802.11b/g/n/ax with 802.11ax HE20, which is Wi-Fi 6.

Not available

Wi-Fi bands

2.4 GHz13Regulatory filingfccid.co/api/files/s2/fccids/2BBGF-W337/files/c1951110_SAR_Test_Report.pdfRead 14 October 2026All Wi-Fi modes are listed at 2412 MHz to 2462 MHz, so 2.4 GHz only.

Not available

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

No13Regulatory filingfccid.co/api/files/s2/fccids/2BBGF-W337/files/c1951110_SAR_Test_Report.pdfRead 14 October 2026The report and the grant list only Bluetooth BR/EDR/LE and 2.4 GHz WLAN transmitters. The COROS connectivity row lists only Bluetooth and Wi-Fi.

No1Maker product pagepolar.com/en/street-xRead 15 October 2026Connectivity lists Bluetooth LE and the USB cable only. No cellular radio is listed.

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.

Not available

No19Spec databasethe5krunner.com/specs/polar/street-xRead 15 October 2026NFC not listed. The page says the watch has no contactless payment.

Contactless payments

No14Reviewtomsguide.com/wellness/smartwatches/coros-pace-4-pro-reviewRead 14 October 2026The specs table lists NFC payments: No, and the smart features section says it does not offer NFC payments. NFC hardware is not ruled out, so the NFC field is not stored.

No19Spec databasethe5krunner.com/specs/polar/street-xRead 15 October 2026No contactless payment.

Payment services

Not available

Not available

Ultra-wideband

Not available

Not available

Satellite

None13Regulatory filingfccid.co/api/files/s2/fccids/2BBGF-W337/files/c1951110_SAR_Test_Report.pdfRead 14 October 2026No satellite radio or satellite messaging in the radio list or the COROS connectivity row.

None1Maker product pagepolar.com/en/street-xRead 15 October 2026Connectivity lists Bluetooth LE and the USB cable only. No satellite link is listed.

ANT+

No19Spec databasethe5krunner.com/specs/coros/pace-4-proRead 14 October 2026The5krunner says sensors connect over Bluetooth only. COROS also lists Bluetooth as the accessory connection, and Tom's Guide says external sensors connect via Bluetooth.

No19Spec databasethe5krunner.com/specs/polar/street-xRead 15 October 2026ANT+ not listed. Connectivity is Bluetooth LE.

Audio

3 of 4 differ

Speaker

Yes1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Data Tracking lists a speaker to take hands-free calls or play activity alerts out loud. The setup guide lists a Drain the Speaker control.5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026Sensor list ends with Speaker and Microphone with noise reduction. Volume settings apply to tones and alerts through the speaker.

Not available

Microphones

Not available

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 only18Reviewactive.com/running/articles/coros-pace-4-pro-reviewRead 14 October 2026The built-in speaker and microphone enable a talk feature when paired with a phone. The COROS store copy says hands-free calls. The watch has no cellular radio, so calls go through the paired phone.

Not available

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

Yes5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026Music: the PACE 4 Pro plays local MP3 files stored on the device.14Reviewtomsguide.com/wellness/smartwatches/coros-pace-4-pro-reviewRead 14 October 2026You can store music on the PACE 4 Pro, but it only supports MP3 files and cannot link to streaming services.

No19Spec databasethe5krunner.com/specs/polar/street-xRead 15 October 2026No music storage.

Controls

4 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.

21Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Design lists Digital Dial, Back Button and Action Button. The dial is a rotating control and is not counted in the two buttons.5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026Operating PACE 4 Pro: Digital Dial (top right), Back/Lap Button (bottom right) and Action Button (bottom left).

55Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/button-functions.htmRead 15 October 2026Your watch has five buttons: CUSTOM (LIGHT), BACK, OK, UP and DOWN. The touch display adds touch control.

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

Back/Lap Button, Action Button1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Design: Back Button and Action Button. Setup guide names them Back/Lap Button and Action Button.5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026

LIGHT (custom button), BACK, OK, UP, DOWN5Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/button-functions.htmRead 15 October 2026Button functions: CUSTOM BUTTON (turns the flashlight on or off by default), BACK, OK, UP/DOWN.

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

Rotating1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026The Digital Dial scrolls and presses to confirm. No haptic claim.5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026Scroll the dial to move the selection and press to confirm.

None5Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/button-functions.htmRead 15 October 2026No crown is described. Controls are five buttons and the touch display.

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

Not available

Not available

Gestures

Raise wrist to wake display5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026Gesture Backlight turns the backlight on when the watch detects a wrist raise.

Not available

Battery and charging

9 of 13 differ

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

447mAh17Retailer pageplaybetter.com/products/coros-pace-4-pro-multisport-gps-smartwatchRead 14 October 2026PlayBetter spec list reads Battery 447mAh. It is the only source for the capacity. COROS does not publish it and no FCC exhibit or teardown states it. Nominal voltage is not given.

385mAh1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: battery capacity 385 mAh, Li-Pol.3Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/technical-specifications.htmRead 15 October 2026385 mAh Li-pol rechargeable battery, replaceable at Polar Central Service.

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.

ACOROS PACE 4 Pro

Mode	With solar	Hours (h)
Smartwatch	No	504
Always-on	No	168
GPS, automatic system selection	No	40
GPS, all systems	No	60
GPS, all systems, always-on display	No	45
GPS, all systems with music	No	17
GPS, dual-band	No	40
GPS, dual-band, always-on display	No	30
GPS, dual-band with music	No	15

Source1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Battery > All Systems On 60 h (45 h with Always-On Display, 17 h with offline music playing), Dual Frequency 40 h (30 h with Always-On Display, 15 h with offline music playing), Daily Use 21 days (7 days with Always-On Display). The Battery Specifications article adds Auto 40+ hours (30+ with Always-On Display), which is stored as 40 with the plus sign here. Days are converted to hours exactly. The 17 and 15 hour music rows do not state the display setting. The store FAQ calls the 45 h figure MAX GPS with dual frequency, which conflicts with the spec table and the battery article, so the spec table is followed.6Maker product pagesupport.coros.com/hc/en-us/articles/23476623096980-Battery-SpecificationsRead 14 October 2026PACE 4 Pro table: Auto 40+ hours (30+ with Always On display), All Systems On / High 60 hours (45), Dual Frequency / Max 40 hours (30), daily use with Sleep Tracking + Daily Stress 21 days (7 days with Always On display). Actual consumption can be higher with backlight, navigation, weak signal and accessories. The Auto row has no always-on option in the schema, so only the 40 hour figure is stored.

BPolar Street X

Mode	With solar	Hours (h)
Smartwatch	No	240
GPS	No	42
Max battery GPS	No	170

Source1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: performance training mode 42 h, eco training mode 170 h, smartwatch mode 10 d. The page text and the launch release say 43 h for the performance mode, which conflicts with the 42 h in the tech specs and the manual. The manual figure is stored.3Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/technical-specifications.htmRead 15 October 2026Performance training mode up to 42 h (optical heart rate on, GPS recording every second). Eco training mode up to 170 h (GPS every 2 minutes, optical heart rate off). Smartwatch mode up to 10 days with continuous heart rate and phone notifications on. 10 days is 240 h.14Maker product pagesupport.polar.com/en/what-is-the-battery-life-of-street-xRead 15 October 2026Performance up to 42 h: optical heart rate on, GPS every 1 second, always-on display off. The scenario text says Dual-Frequency GPS ON, while the product page never claims dual-frequency GNSS and the5krunner says single-frequency, so the row is stored as plain GPS. Eco up to 170 h: optical heart rate off, single-frequency GPS every 2 minutes. Smartwatch up to 10 days with phone notifications on, always-on display off and Do Not Disturb 8 h at night. Stored eco row as the maximum-saving GPS mode, like the Vantage V3 file.

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.

504h=CalculatedFrom Claimed battery life

240h=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.

168h=CalculatedFrom Claimed battery life

Not available

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

42h=CalculatedFrom Claimed battery life

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.

Proprietary plug5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026Metal pins on the A2 adapter plug into the charging port on the back of the watch and snap into place. The standard USB-C cable connects to the A2 and not to the watch.7Maker product pagesupport.coros.com/hc/en-us/articles/53639686483988-Charging-Your-PACE-4-ProRead 14 October 2026The adapter pins fit into the charging port on the back of the watch and the adapter takes any standard USB-C cable.

Magnetic pins1Maker product pagepolar.com/en/street-xRead 15 October 2026Tech specs: USB cable Proprietary / USB-C. The cable snaps on magnetically (manual).

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

The COROS A2 charging adapter clips onto the watch and takes any standard USB-C cable. COROS asks for an LPS-certified charger and says to use only 5V/1A charging ports with no fast-charge cables or power banks.7Maker product pagesupport.coros.com/hc/en-us/articles/53639686483988-Charging-Your-PACE-4-ProRead 14 October 2026Use an LPS-compliant charger and official accessories. Do not use a battery pack with quick-charge capability. The Maintenance and Support article says to use only 5V/1A charging ports and no fast-charge cables or power banks.

Charge with the included Polar Charge 2.0 cable, which snaps on magnetically. A USB power adapter is not included. Polar asks for an adapter marked output 5 Vdc that provides at least 500 mA and has an approval mark such as LPS, UL listed or CE. The watch can charge during training. An optional charge limit of 80% is in the battery settings.6Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/batteries.htmRead 15 October 2026Charging the battery: custom cable snaps in magnetically. A USB power adapter is not included. Adapter marked output 5 Vdc, at least 500 mA, LPS, UL listed or CE. Charging during training is possible. Charge limit 80% in Settings > General settings > Battery.

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.

Not available

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 time30 minUse time10 h2Maker product pagecoros.com/pace4proRead 14 October 2026The buy page FAQ says 30 minutes of charging returns roughly 10 hours of GPS. The GPS mode is not stated.

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.

90min1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Battery > Charging Time About 1.5 hours. The store FAQ says approximately 1.5 hours from 0 to 100% in normal temperature. Stored as 90 minutes, a nominal claim and not a measured test.

Not available

Measured

None of 4 known

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.

Not available

Not available

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

4 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.

22mm1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Watch Band > Width 22mm.

22mm7Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/changeable-wristband.htmRead 15 October 2026Compatible with standard 22 mm wristbands, no adapters needed.

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

Yes1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Watch Band > Installation Type Quick Release.

Yes7Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/changeable-wristband.htmRead 15 October 2026To detach a band, pull the quick-release knob inwards.

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

22 mm quick-release straps1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Watch Band > Width 22mm with Quick Release installation.

Standard 22 mm spring bars with a quick-release knob. No adapters needed7Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/changeable-wristband.htmRead 15 October 2026Standard 22 mm spring bars. Any band that uses 22 mm spring bars fits.

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

Nylon1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Materials > Band Material Silicone / Nylon. The base is the Black nylon package. The silicone SKUs are variants.

Silicone3Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/technical-specifications.htmRead 15 October 2026Wristband: silicone, aluminum buckle, stainless steel spring bars.

Strap

Black nylon band1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026The COROS store names the options Black / Nylon, Black / Silicone and White / Silicone.

POLAR Street Wristband, 22mm1Maker product pagepolar.com/en/street-xRead 15 October 2026What's included: POLAR Street Wristband, 22mm.

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

ACOROS PACE 4 Pro

Size	Wrist (min) (mm)	Wrist (max) (mm)
Nylon	135	205

Source1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026Watch Band: nylon 135-205 mm, silicone 140-220 mm.

BPolar Street X

Not available

Regulatory

1 of 3 differ

FCC ID

2BBGF-W33712Regulatory filingfccid.co/fcc/2BBGF-W337Read 14 October 2026FCC ID 2BBGF-W337, model W337, COROS PACE 4 Pro, grant date Sep 29, 2026. Read on a public mirror of the FCC filing. The grant notes list BLE and 2.4GHz WLAN transmitters only.

INW6J16Regulatory filingsupport.polar.com/e_manuals/Regulatory_information/enote-rf-street-x.pdfRead 15 October 2026Model number 6J, FCC ID INW6J, IC 6248A-6J.

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.

0.343W/kg13Regulatory filingfccid.co/api/files/s2/fccids/2BBGF-W337/files/c1951110_SAR_Test_Report.pdfRead 14 October 2026FCC SAR test report DDT-RE26070744-2E04, issued 2026-09-21: highest reported extremity (10-g) SAR at 0 mm is 0.343 W/kg for 2.4 GHz Wi-Fi. Bluetooth extremity is 0.033 W/kg. Limit 4.0 W/kg. This is the US regime.

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.

Not available

Not available

Other certifications

Not available

Not available

In the box

1 of 2 differ

In the box

COROS PACE 4 Pro GPS Watch, COROS A2 Charging Adapter5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026What's In the Box: COROS PACE 4 Pro GPS Watch and COROS A2 Charging Adapter. The buy page adds that a USB-C charging cable is not included. The strap is not named in the list.

POLAR Street X, POLAR Street Wristband, 22mm, Polar Charge 2.01Maker product pagepolar.com/en/street-xRead 15 October 2026What's included: POLAR Street X, POLAR Street Wristband 22 mm, Polar Charge 2.0.

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

No5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026The A2 is a watch-side charging adapter. The box has no mains or USB power adapter and no USB-C cable.

No1Maker product pagepolar.com/en/street-xRead 15 October 2026The box has the watch, the wristband and the Polar Charge 2.0 cable. No power adapter is listed.

Links

Not compared

Product page

coros.com/pace4pro2Maker product pagecoros.com/pace4proRead 14 October 2026COROS PACE 4 Pro overview page.

www.polar.com/en/street-x1Maker product pagepolar.com/en/street-xRead 15 October 2026The maker's product page.

Spec sheet

coros.com/pace4pro/specs1Maker product pagecoros.com/pace4pro/specsRead 14 October 2026

support.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/technical-specifications.htm3Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/technical-specifications.htmRead 15 October 2026Street X user manual technical specification page.

Manual

support.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-Pro5Owner's manualsupport.coros.com/hc/en-us/articles/53610991583508-Set-Up-Your-COROS-PACE-4-ProRead 14 October 2026Set Up Your COROS PACE 4 Pro, the model setup and operating guide, last edited 2026-09-20.

support.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/introduction.htm4Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/introduction.htmRead 15 October 2026Polar Street X user manual, introduction.

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.

Not available

Not available

Warranty

0 of 1 differ

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.

2years11Maker product pagesupport.coros.com/hc/en-us/articles/360039803532-COROS-Warranty-PolicyRead 14 October 2026COROS offers a 2-year warranty from the original activation date for watches that contain batteries. Straps, charging cables and non-battery accessories have 6 months. Local consumer law rights may differ. The COROS store metafield also says 2-year.

2years12Owner's manualsupport.polar.com/e_manuals/street-x/polar-street-x-user-manual-english/guarantee.htmRead 15 October 2026Limited International Polar Guarantee: two years from the date of purchase. Silicone or plastic wristbands one year.

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