| Display | 1.39-inch AMOLED touchscreen, 454 x 454, 326 ppi, sapphire crystal glass, always-on option, ambient light sensor | Largest display of any Apple Watch (LTPO3, wide-angle OLED, borders 24% thinner), 1Hz Always-On refresh |
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| Body | 48.6 x 48.6 x 13.4 mm; 79 g with wristband (57 g without); stainless steel case and bezel; 22 mm quick-release wristbands; WR100 water resistance; MIL-STD-810H tested; -20 to 50 C operating temperature | — |
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| Battery | Up to 11 days in smartwatch mode; up to 40 hours in performance training mode; up to 110 hours in eco training mode; 488 mAh rechargeable Li-Pol battery (Polar's launch announcement quoted up to 10 days, 43 hours and 140 hours) | Up to 42 hours; up to 72 hours in Low Power Mode; 15 minutes of fast charging adds up to 12 hours |
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| Storage | 32 GB for training data, offline maps and routes | — |
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| Sensors | Polar Elixir biosensing: 4th-generation optical heart rate, wrist-based ECG, SpO2, nightly skin temperature; barometer, magnetometer compass, accelerometer, gyroscope | — |
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| GPS | Dual-frequency GPS with GLONASS, Galileo, BeiDou and QZSS | — |
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| Navigation | Preloaded maps of Europe and North America, downloadable regions and contour maps in Polar Flow, Breadcrumbs, turn-by-turn navigation powered by komoot, Strava route sync, Track Back, Back to Start | — |
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| Connectivity | Bluetooth LE, USB-C charging cable (proprietary connector) | 5G cellular, built-in two-way satellite communications, dual-frequency GPS |
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| Software | Polar Flow app; Training Load Pro, Recovery Pro, Nightly Recharge, SleepWise, FitSpark, FuelWise, Hill Splitter, orthostatic and running tests | — |
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| Extras | Built-in flashlight; wrist-based running power; vertical speed, VAM and 3D speed | — |
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| Colors | Night Black, Stone-Gray; Grit X2 Pro Titan edition with titanium front casing and an extra leather wristband | — |
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| Case | — | Titanium (natural, black), 100% recycled titanium, 3D-printed |
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| Health Sensors | — | Optical heart sensor with hypertension notifications, sleep score, ECG, blood oxygen, sleep apnea notifications, water temperature |
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| Water Resistance | — | WR100; Oceanic+ dive computer app |
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| OS | — | watchOS 26 (requires iPhone 11 or later with iOS 26) |
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