Material and Finish
Aluminum case
Midnight
Midnight
Silver
Size and Weight
44mm
Height: 44mm
Width: 38mm
Depth: 10.7mm
Weight (GPS): 32.9 grams
Weight (GPS + Cellular): 33 grams
Fits 140–245mm wrists
40mm
Height: 40mm
Width: 34mm
Depth: 10.7mm
Weight (GPS): 26.4 grams
Weight (GPS + Cellular): 27.8 grams
Fits 130–200mm wrists
Hardware and Buttons
Digital Crown
Microphone
Side button
Speaker/air vent
Optical heart sensor
Controls
Digital Crown with haptic feedback
Side button
Siri
Chip
S8 SiP with 64-bit dual-core processor
2-core Neural Engine
32GB capacity
Sensors
Second-generation optical heart sensor
Compass
Always-on altimeter
High-g accelerometer
High dynamic range gyroscope
Ambient light sensor
Health and Wellness
Heart Rate app
High and low heart rate notifications
Irregular rhythm notifications1
Medications app
Mindfulness app
Noise app
Sleep app including sleep stages
Display
Retina LTPO OLED display
Ion-X front glass
Up to 1000 nits maximum brightness
326 pixels per inch
Power and Battery Life
All-day battery life, up to 18 hours of normal use2
Built-in rechargeable lithium-ion battery
Up to 80% charge in about 1.5 hours3
Learn more about Power and Battery Life
Operating System
watchOS
watchOS is the world’s most advanced wearable operating system, with apps and features designed to keep you active, healthy, safe, and connected.
Learn more about watchOS
Workouts and Activity
Running
Custom interval workouts
Customizable Workout Views
Heart Rate Zones
Race Route
Stride length, ground contact time, and vertical oscillation
Automatic track detection
Multisport workout
Hiking
Bearing, incline, elevation, and coordinates
Custom waypoints
Automatically generated waypoints to cellular connectivity
Backtrack GPS data
Topographic maps for over 1000 national and regional parks (U.S. only)
Cycling
Average speed, elevation gained, and distance
Connection to cycling accessories via Bluetooth
Functional Threshold Power
Power Zones
Cadence
Live Activity on iPhone
Swimming
Pool swim or open water swim
Splits and auto sets
SWOLF score
Automatic stroke detection
Kickboard
Average pace, total distance, and laps
More Workouts
Walk
Elliptical
Rower
Stair Stepper
HIIT
Yoga
Functional Strength Training
Dance
Cooldown
Core Training
Pilates
Tai Chi
Wheelchair
Kickboxing
Multisport
Other
Safety
Emergency SOS4
International emergency calling5
Crash Detection4
Fall Detection