| Display | Always-On Retina LTPO OLED, up to 2000 nits maximum, 1 nit minimum, 326 ppi; Ion-X glass (aluminum) or sapphire (stainless steel) | 1.3" (43mm) 432x432 / 1.5" (47mm) 480x480 Super AMOLED, sapphire crystal, Always On Display, 2,000 nits peak |
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| Chipset | S9 SiP (64-bit dual-core, 4-core Neural Engine), second-generation Ultra Wideband | Exynos W930 dual-core 1.4GHz |
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| Storage | 64GB | — |
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| Sizes | 41mm (31.9 g aluminum GPS) and 45mm (38.7 g aluminum GPS); 10.7 mm deep | — |
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| Battery | Up to 18 hours of normal use; up to 36 hours in Low Power Mode; fast charging to 80% in about 45 minutes | Up to 40 hours (Always On Display off) / up to 30 hours (on); 300 mAh (43mm) / 425 mAh (47mm) |
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| Sensors | Third-generation optical heart sensor, electrical heart sensor (ECG app), temperature sensing, compass, always-on altimeter, high-g accelerometer, gyroscope, ambient light sensor | Samsung BioActive Sensor (optical heart rate, electrical heart signal, bioelectrical impedance), temperature, accelerometer, barometer, gyro, geomagnetic, light, 3D Hall sensor |
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| Connectivity | Wi-Fi 4, Bluetooth 5.3, GPS/GNSS (L1), optional LTE and UMTS | Bluetooth 5.3, Wi-Fi 2.4+5GHz, NFC, GPS/GLONASS/BeiDou/Galileo, optional LTE |
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| Durability | Water resistance 50 m (ISO 22810:2010), IP6X dust resistance | — |
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| Controls | Digital Crown, side button, new double tap gesture, on-device Siri | — |
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| OS | watchOS 10 | Wear OS 4 (Wear OS Powered by Samsung), One UI 5 Watch |
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| Case | — | 43mm: 42.5 x 42.5 x 10.9 mm, 52.0 g / 47mm: 46.5 x 46.5 x 10.9 mm, 59.0 g, rotating bezel |
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| Memory | — | 2GB RAM + 16GB storage |
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| Water Resistance | — | 5ATM + IP68, MIL-STD-810H |
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| Compatibility | — | Android 10 or higher with more than 1.5GB of memory |
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| Features | — | Sleep coaching, body composition, ECG and blood pressure (select markets, Samsung phone), irregular heart rhythm notification, skin temperature, fall detection, Samsung Wallet |
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