Material and Finish
Aluminum case
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Midnight
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Midnight
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Silver
Size and Weight
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44mm
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Height: 44mm
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Width: 38mm
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Depth: 10.7mm
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Weight (GPS): 32.9 grams
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Weight (GPS + Cellular): 33 grams
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Fits 140–245mm wrists
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40mm
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Height: 40mm
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Width: 34mm
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Depth: 10.7mm
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Weight (GPS): 26.4 grams
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Weight (GPS + Cellular): 27.8 grams
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Fits 130–200mm wrists
Hardware and Buttons
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Digital Crown
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Microphone
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Side button
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Speaker/air vent
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Optical heart sensor
Controls
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Digital Crown with haptic feedback
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Side button
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Siri
Chip
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S8 SiP with 64-bit dual-core processor
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2-core Neural Engine
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32GB capacity
Sensors
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Second-generation optical heart sensor
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Compass
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Always-on altimeter
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High-g accelerometer
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High dynamic range gyroscope
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Ambient light sensor
Health and Wellness
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Heart Rate app
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High and low heart rate notifications
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Irregular rhythm notifications1
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Medications app
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Mindfulness app
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Noise app
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Sleep app including sleep stages
Display
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Retina LTPO OLED display
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Ion-X front glass
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Up to 1000 nits maximum brightness
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326 pixels per inch