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    Samsung Galaxy Watch 9 40mm Highlights

    • Up to 30 hours per charge
    • 1.47-inch OLED display
    • 3,000 nits peak brightness
    • IP68 dust and water resistance
    • 31.5 g weight
    • 32GB storage, with 2GB RAM

    Compare Samsung Galaxy Watch 9 40mm with Similar Products

    Compare Samsung Galaxy Watch 9 40mm specs, features and price with similar smartwatches and alternatives.

    Compare Samsung Galaxy Watch 9 40mm with Similar Products
    Selected Item
    Samsung Galaxy Watch 9 40mmKSh 39,500Add to cart
    Samsung Galaxy Watch 9 44mmKSh 42,000Add to cart
    Samsung Galaxy Watch 8 ClassicKSh 38,500Add to cart
    OnePlus Watch 4KSh 38,500Add to cart

    Identity & design

    Identity & design specifications comparison
    SpecificationSamsung Galaxy Watch 9 40mmSamsung Galaxy Watch 9 44mmSamsung Galaxy Watch 8 ClassicOnePlus Watch 4
    BrandSamsungSamsungSamsungOnePlus
    ModelSamsung Galaxy Watch 9 (40 mm and 44 mm configurations)Samsung Galaxy Watch 9 (40 mm and 44 mm configurations)Samsung Galaxy Watch 8 ClassicOnePlus Watch 4
    Announced2026, July 222026, July 222025, July 092026, April 22
    Dimensions44 mm: 46.0 × 43.7 × 8.6 mm; 40 mm: 42.7 × 40.4 × 8.6 mm44 mm: 46.0 × 43.7 × 8.6 mm; 40 mm: 42.7 × 40.4 × 8.6 mm46.4 × 46.0 × 10.6 mm47.4 × 47.4 × 11.0 mm
    Weight44 mm: 34.0 g; 40 mm: 31.5 g, without band44 mm: 34.0 g; 40 mm: 31.5 g, without band63.5 g without bandApproximately 43 g without strap; 68 g with strap
    Build materialsAluminum caseAluminum caseStainless-steel caseTitanium-alloy case; PA and fibreglass back
    Strap / bandLightweight breathable Sport Band with Dynamic Lug SystemLightweight breathable Sport Band with Dynamic Lug SystemNot specifiedFluororubber
    Controls / buttonsTouchscreen and two side buttonsTouchscreen and two side buttonsRotating bezel; Quick Button; Home and Back buttonsNot specified
    Wrist sizeNot specifiedNot specifiedNot specified140–210 mm

    Display

    Display specifications comparison
    SpecificationSamsung Galaxy Watch 9 40mmSamsung Galaxy Watch 9 44mmSamsung Galaxy Watch 8 ClassicOnePlus Watch 4
    Display44 mm: 1.47-inch Super AMOLED; 40 mm: 1.34-inch Super AMOLED44 mm: 1.47-inch Super AMOLED; 40 mm: 1.34-inch Super AMOLED1.34-inch Super AMOLED1.5-inch LTPO OLED
    Screen resolution44 mm: 480 × 480 pixels; 40 mm: 438 × 438 pixels44 mm: 480 × 480 pixels; 40 mm: 438 × 438 pixels438 × 438 pixels466 × 466 pixels; 310 ppi
    Display protectionSapphire crystalSapphire crystalSapphire crystalSapphire crystal
    Display features3000 nits (peak)3000 nits (peak)Full-colour always-on display600 nits (typ), 1600 nits (HBM), 3000 nits (peak)

    Performance & software

    Performance & software specifications comparison
    SpecificationSamsung Galaxy Watch 9 40mmSamsung Galaxy Watch 9 44mmSamsung Galaxy Watch 8 ClassicOnePlus Watch 4
    ProcessorQualcomm Snapdragon Wear Elite, 3 nmQualcomm Snapdragon Wear Elite, 3 nmExynos W1000, 3 nmQualcomm Snapdragon W5; BES2800 MCU
    CPU5-core5-core5-coreNot specified
    RAM2 GB2 GB2 GB2 GB
    Storage32 GB32 GB64 GB32 GB
    Operating systemWear OS 7; One UI 9 WatchWear OS 7; One UI 9 WatchWear OS 6; One UI 8 WatchOxygenOS Watch 8; Wear OS 6.0
    GPUNot specifiedNot specifiedMali-G68Not specified

    Connectivity

    Connectivity specifications comparison
    SpecificationSamsung Galaxy Watch 9 40mmSamsung Galaxy Watch 9 44mmSamsung Galaxy Watch 8 ClassicOnePlus Watch 4
    Network / cellularGSM / HSPA / LTEGSM / HSPA / LTEGSM / HSPA / LTENo cellular connectivity
    SIM / eSIMeSIMeSIMeSIMUnsupported
    Wi-FiWi-Fi 2.4 GHz + 5 GHzWi-Fi 2.4 GHz + 5 GHzWi-Fi 2.4 GHz + 5 GHzWi-Fi 2.4 GHz + 5 GHz
    BluetoothBluetooth 5.3Bluetooth 5.3Bluetooth 5.3Bluetooth 5.2
    NFCSupportedSupportedSupportedSupported
    Positioning / GNSSDual-frequency GPS, L1 + L5Dual-frequency GPS, L1 + L5Dual-frequency GPS, L1 + L5; GLONASS; BeiDou; GalileoDual-frequency L1 + L5; GPS; BeiDou; Galileo; GLONASS; QZSS

    Audio & communication

    Audio & communication specifications comparison
    SpecificationSamsung Galaxy Watch 9 40mmSamsung Galaxy Watch 9 44mmSamsung Galaxy Watch 8 ClassicOnePlus Watch 4
    SpeakerSupportedSupportedSupportedSupported
    MicrophoneSupportedSupportedSupportedSupported
    CallingBluetooth calling with a connected smartphone; standalone calling on LTE editionsBluetooth calling with a connected smartphone; standalone calling on LTE editionsBluetooth calling with a connected smartphone; standalone calling on LTE editionsBluetooth calling with a connected smartphone

    Sensors, health & fitness

    Sensors, health & fitness specifications comparison
    SpecificationSamsung Galaxy Watch 9 40mmSamsung Galaxy Watch 9 44mmSamsung Galaxy Watch 8 ClassicOnePlus Watch 4
    SensorsSamsung BioActive: optical heart-rate, electrical heart signal, bioelectrical impedance analysis; temperature; accelerometer; barometer; gyroscope; geomagnetic; light sensorSamsung BioActive: optical heart-rate, electrical heart signal, bioelectrical impedance analysis; temperature; accelerometer; barometer; gyroscope; geomagnetic; light sensorSamsung BioActive: optical heart-rate, electrical heart signal, bioelectrical impedance analysis; temperature; accelerometer; barometer; gyroscope; geomagnetic; light sensor; 3D Hall sensorAccelerometer; gyroscope; optical heart-rate sensor; optical blood-oxygen sensor; geomagnetic sensor; ambient-light sensor; barometer; wrist-temperature sensor
    Health & wellness featuresHeart rate; SpO₂; ECG; body composition; temperature; stress; Vitals; Heart Health ScoreHeart rate; SpO₂; ECG; body composition; temperature; stress; Vitals; Heart Health ScoreHeart and wellness tracking; Antioxidant Index, Vascular Load, Energy Score and stress features. Availability varies by market and paired phone.Heart rate; high and low heart-rate alerts; SpO₂ spot checks and all-day monitoring; stress; breathing exercises; cycle tracking; 60-second Wellness Overview
    Sleep trackingSleep-stage tracking; sleep-apnea risk detection; sleep VitalsSleep-stage tracking; sleep-apnea risk detection; sleep VitalsSleep tracking, sleep coaching, Bedtime Guidance and sleep-apnoea features where availableDeep, light and REM sleep; awake time; sleep score; breathing rate; SpO₂; snoring-risk assessment
    Sports / workout modesAutomatic and manual workout tracking across running, walking, cycling, swimming and other activitiesAutomatic and manual workout tracking across running, walking, cycling, swimming and other activitiesNot specified100+ sports modes
    Training & outdoor featuresDaily Cardio Load; Fitness Index; workout and recovery guidanceDaily Cardio Load; Fitness Index; workout and recovery guidanceRunning Coach and dual-frequency route trackingAerobic training effect; cardiorespiratory capacity; recovery time; heart-rate recovery; running form; track running
    Safety & emergency featuresFall detection and Emergency SOSFall detection and Emergency SOSNot specifiedFall detection; emergency rescue

    Battery & durability

    Battery & durability specifications comparison
    SpecificationSamsung Galaxy Watch 9 40mmSamsung Galaxy Watch 9 44mmSamsung Galaxy Watch 8 ClassicOnePlus Watch 4
    Battery capacity44 mm: 445 mAh; 40 mm: 390 mAh44 mm: 445 mAh; 40 mm: 390 mAh445 mAh646 mAh typical; 632 mAh rated
    Battery lifeUp to 30 hours with AOD onUp to 30 hours with AOD onAlways-On Display off: up to 40 hours Always-On Display on: up to 30 hoursUp to 5 days smart mode; 3 days heavy use; 16 days power saver
    ChargingFast wireless charging, WPC-basedFast wireless charging, WPC-basedFast wireless charging, WPC-basedCharging base with USB-C cable
    Water resistance5 ATM; IP685 ATM; IP685 ATM; IP685 ATM; IP69; IP68
    Durability / certificationsMIL-STD-810HMIL-STD-810HMIL-STD-810HMIL-STD-810H

    Compatibility

    Compatibility specifications comparison
    SpecificationSamsung Galaxy Watch 9 40mmSamsung Galaxy Watch 9 44mmSamsung Galaxy Watch 8 ClassicOnePlus Watch 4
    Phone compatibilityAndroid 13.0 or later; more than 1.5 GB RAM; Google Mobile ServicesAndroid 13.0 or later; more than 1.5 GB RAM; Google Mobile ServicesAndroid 12.0 or later; more than 1.5 GB RAMAndroid 9.0 or later; GMS 23.45.23 or later
    Companion appGalaxy Wearable; Samsung HealthGalaxy Wearable; Samsung HealthGalaxy Wearable; Samsung HealthOHealth
    Colors44 mm: Graphite, Silver; 40 mm: Graphite, Cream44 mm: Graphite, Silver; 40 mm: Graphite, CreamBlack; WhiteMidnight Titanium; Evergreen Titanium

    Additional specifications

    Additional specifications specifications comparison
    SpecificationSamsung Galaxy Watch 9 40mmSamsung Galaxy Watch 9 44mmSamsung Galaxy Watch 8 ClassicOnePlus Watch 4
    Case materialAluminumAluminumStainless steelTitanium alloy
    Peak brightness3,000 nits peak3,000 nits peak3,000 nits peak600 nits typical; 1,500 nits high-brightness mode; 3,000 nits peak in supported sports modes
    Charging time44 mm: 100% in 90 minutes, 45% in 30 minutes; 40 mm: 100% in 80 minutes, 50% in 30 minutes44 mm: 100% in 90 minutes, 45% in 30 minutes; 40 mm: 100% in 80 minutes, 50% in 30 minutesNot specifiedApproximately 75 minutes
    Release statusAvailable. Released 2026, August 07Available. Released 2026, August 07Available. Released 2025, July 25Available. Released 2026, April
    Model numbersSM-L340, SM-L350, SM-L345F, SM-L355F, SM-L345U, SM-L355USM-L340, SM-L350, SM-L345F, SM-L355F, SM-L345U, SM-L355USM-L500, SM-L505UNot specified
    Card slotNoNoNoNo
    CameraNoNoNoNo
    3.5 mm headphone jackNoNoNoNo
    USBNoNoNoNo
    RadioNoNoNoNo
    2G bandsGSM 850 / 900 / 1800 / 1900GSM 850 / 900 / 1800 / 1900GSM 850 / 900 / 1800 / 1900Not specified
    3G bandsHSDPA 850 / 900 / 2100HSDPA 850 / 900 / 2100HSDPA 850 / 900 / 2100Not specified
    4G bands1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 34, 38, 39, 40, 41, 66, 711, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 34, 38, 39, 40, 41, 66, 711, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 40, 66, 71Not specified
    Network speedHSPA, LTEHSPA, LTEHSPA, LTENot specified
    SAR (US)1.06 W/kg (body)1.06 W/kg (body)1.04 W/kg (head) 0.41 W/kg (body)Not specified
    SAR (EU)0.70 W/kg (body)0.70 W/kg (body)0.03 W/kg (head) 0.67 W/kg (body)Not specified
    Additional durability featuresArmor Aluminum 2Armor Aluminum 2Rotating bezelNot specified
    Pixels per inchNot specifiedNot specifiedNot specified310 ppi
    Packing listNot specifiedNot specifiedNot specifiedWatch; charging base; strap; USB-C cable; user guide; safety and warranty booklet
    Smart recognitionNot specifiedNot specifiedNot specifiedRunning; walking; cycling; swimming; rowing machine; elliptical
    Maximum charging powerNot specifiedNot specifiedNot specifiedApproximately 7.5 W
    Operating temperatureNot specifiedNot specifiedNot specified0–35 °C

    Specs

    Samsung Galaxy Watch 9 40mm specifications

    Identity & design

    Samsung Galaxy Watch 9 40mm — Identity & design
    BrandSamsung
    ModelSamsung Galaxy Watch 9 (40 mm and 44 mm configurations)
    Announced2026, July 22
    Dimensions44 mm: 46.0 × 43.7 × 8.6 mm; 40 mm: 42.7 × 40.4 × 8.6 mm
    Weight44 mm: 34.0 g; 40 mm: 31.5 g, without band
    Build materialsAluminum case
    Strap / bandLightweight breathable Sport Band with Dynamic Lug System
    Controls / buttonsTouchscreen and two side buttons

    Display

    Samsung Galaxy Watch 9 40mm — Display
    Display44 mm: 1.47-inch Super AMOLED; 40 mm: 1.34-inch Super AMOLED
    Screen resolution44 mm: 480 × 480 pixels; 40 mm: 438 × 438 pixels
    Display protectionSapphire crystal
    Display features3000 nits (peak)
    Peak brightness3,000 nits peak

    Performance & software

    Samsung Galaxy Watch 9 40mm — Performance & software
    ProcessorQualcomm Snapdragon Wear Elite, 3 nm
    CPU5-core
    RAM2 GB
    Storage32 GB
    Operating systemWear OS 7; One UI 9 Watch

    Connectivity

    Samsung Galaxy Watch 9 40mm — Connectivity
    Network / cellularGSM / HSPA / LTE
    SIM / eSIMeSIM
    Wi-FiWi-Fi 2.4 GHz + 5 GHz
    BluetoothBluetooth 5.3
    NFCSupported
    Positioning / GNSSDual-frequency GPS, L1 + L5
    USBNo
    RadioNo
    2G bandsGSM 850 / 900 / 1800 / 1900
    3G bandsHSDPA 850 / 900 / 2100
    4G bands1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 34, 38, 39, 40, 41, 66, 71
    Network speedHSPA, LTE

    Audio & communication

    Samsung Galaxy Watch 9 40mm — Audio & communication
    SpeakerSupported
    MicrophoneSupported
    CallingBluetooth calling with a connected smartphone; standalone calling on LTE editions

    Sensors, health & fitness

    Samsung Galaxy Watch 9 40mm — Sensors, health & fitness
    SensorsSamsung BioActive: optical heart-rate, electrical heart signal, bioelectrical impedance analysis; temperature; accelerometer; barometer; gyroscope; geomagnetic; light sensor
    Health & wellness featuresHeart rate; SpO₂; ECG; body composition; temperature; stress; Vitals; Heart Health Score
    Sleep trackingSleep-stage tracking; sleep-apnea risk detection; sleep Vitals
    Sports / workout modesAutomatic and manual workout tracking across running, walking, cycling, swimming and other activities
    Training & outdoor featuresDaily Cardio Load; Fitness Index; workout and recovery guidance
    Safety & emergency featuresFall detection and Emergency SOS

    Battery & durability

    Samsung Galaxy Watch 9 40mm — Battery & durability
    Battery capacity44 mm: 445 mAh; 40 mm: 390 mAh
    Battery lifeUp to 30 hours with AOD on
    ChargingFast wireless charging, WPC-based
    Water resistance5 ATM; IP68
    Durability / certificationsMIL-STD-810H

    Compatibility

    Samsung Galaxy Watch 9 40mm — Compatibility
    Phone compatibilityAndroid 13.0 or later; more than 1.5 GB RAM; Google Mobile Services
    Companion appGalaxy Wearable; Samsung Health
    Colors44 mm: Graphite, Silver; 40 mm: Graphite, Cream

    Design

    Samsung Galaxy Watch 9 40mm — Design
    Case materialAluminum

    Battery

    Samsung Galaxy Watch 9 40mm — Battery
    Charging time44 mm: 100% in 90 minutes, 45% in 30 minutes; 40 mm: 100% in 80 minutes, 50% in 30 minutes

    General

    Samsung Galaxy Watch 9 40mm — General
    Release statusAvailable. Released 2026, August 07
    Model numbersSM-L340, SM-L350, SM-L345F, SM-L355F, SM-L345U, SM-L355U

    Memory & storage

    Samsung Galaxy Watch 9 40mm — Memory & storage
    Card slotNo

    Cameras

    Samsung Galaxy Watch 9 40mm — Cameras
    CameraNo

    Audio

    Samsung Galaxy Watch 9 40mm — Audio
    3.5 mm headphone jackNo

    Regulatory

    Samsung Galaxy Watch 9 40mm — Regulatory
    SAR (US)1.06 W/kg (body)
    SAR (EU)0.70 W/kg (body)

    Durability

    Samsung Galaxy Watch 9 40mm — Durability
    Additional durability featuresArmor Aluminum 2

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