| Display | 1.62" AMOLED touchscreen, 192x490, 60Hz, up to 1,200 nits | Flat crystal, up to 3000 nits |
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| Body | 46.53 x 21.63 x 10.95 mm (without strap and sensor), 15.8 g without strap; aluminium alloy frame with TPU strap; fits 135-210 mm wrists | — |
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| Battery | Up to 21 days (typical use), up to 9 days with always-on display, up to 6.6 days heavy use; 233 mAh, magnetic charging in about 1 hour | Up to 36 hours; up to about 60 hours in low-power mode |
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| Sensors | Accelerometer, gyroscope, optical heart-rate sensor, ambient light sensor | — |
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| Durability | 5 ATM water resistance | — |
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| Sports | 150+ sports modes, all-day heart rate, blood oxygen, stress and sleep monitoring | — |
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| OS | Mi Fitness app; compatible with Android 8.0+ and iOS 12.0+ | watchOS 10 (at launch) |
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| Colors | Midnight Black, Glacier Silver, Mystic Rose, Arctic Blue, Titan Gray | — |
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| Case Size | — | 49mm titanium |
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| Chipset | — | Apple S9 SiP, 2nd-gen Ultra Wideband |
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| Health Sensors | — | Heart rate, water temperature, sleep apnea detection, blood oxygen (calculated on paired iPhone) |
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| Water Resistance | — | WR100 / EN13319, recreational dives to 40 m |
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| Connectivity | — | Cellular, dual-frequency GPS (L1 + L5) |
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