| Case Size | 40mm / 44mm aluminium (midnight, starlight) | — |
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| Display | Always-On display; cover glass 4x more resistant to cracks than previous generation (Ion-X) | 1.28-inch AMOLED touchscreen, 416 x 416, always-on option, Gorilla Glass 3 |
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| Chipset | Apple S10 | — |
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| Battery | Up to 18 hours; 15 minutes of fast charging adds up to 8 hours, about 80% in 45 minutes | Up to 10 days in smartwatch mode; up to 43 hours with GPS in performance training mode (170 hours in eco mode); 385 mAh, replaceable |
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| Health Sensors | Heart rate, wrist temperature sensing, sleep score, sleep apnea notifications, retrospective ovulation estimates | — |
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| Connectivity | 5G cellular models | Bluetooth LE; proprietary USB-C charging cable |
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| OS | watchOS 26 (requires iPhone 11 or later with iOS 26) | — |
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| Body | — | 45 x 45 x 13.8 mm; 48 g with wristband, 28 g without; bio-based plastic case; 22 mm quick-release strap |
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| Positioning | — | GPS, Galileo, BeiDou, QZSS with assisted GPS; barometer, compass; route guidance and back to start |
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| Sensors | — | Precision Prime optical heart rate, nightly skin temperature, accelerometer, gyroscope, barometer, magnetometer; no ECG or SpO2 |
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| Durability | — | WR50 water resistance; tested to MIL-STD-810H; -20 to 50 °C operation |
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| Sports | — | 170+ sports and activities, Training Load Pro, Nightly Recharge, SleepWise, Sleep Plus Stages |
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| Performance | — | 275 MHz CPU, 5 MB memory, 32 MB storage |
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| Extras | — | Integrated LED flashlight with white and red light; Polar Flow app and web service included |
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| Colors | — | Night Black, Snow White, Forest Green |
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