Display
Always-On Retina display
Always-On technology keeps the display on so you can see information at a glance. And with a maximum brightness of 2000 nits, twice that of Series 8 and SE, it's easier to read in bright sunlight. Detailed watch faces look stunning, even when your wrist is down. The edge-to-edge design accommodates your favorite complications and makes tapping, typing, and swiping easy.

Materials and Finishes
Aluminum
100% recycled aluminum . Features a thick front crystal with a flat base and robust geometry for durability and crack resistance. Ion-X front glass on aluminum models. Sapphire front crystal on stainless steel models.

Health and Wellness
Blood Oxygen app
ECG app
High and low heart rate notifications
Irregular rhythm notifications
Sleep stages
Mental wellbeing
Cycle Tracking with retrospective ovulation estimates
Log your state of mind in the Mindfulness app and get insights into your mental health. Temperature sensing works with Cycle Tracking to help you better understand your menstrual cycle.Measure your blood oxygen levels,take an ECG from your wrist,be alerted if it detects unusually high or low heart rates or an irregular rhythm, measure your current heart rate. And learn more about your time asleep with sleep stages

Controls
Double tap gesture
Faster on-device Siri
with health data access
Digital Crown with haptic feedback
Side button

Cellular Connectivity
Cellular connectivity on GPS + Cellular models
Cellular connectivity waypoints
Supports Family Setup
International roaming
With an active cellular plan, make calls, send texts, stream music, and make emergency calls without your iPhone nearby.Pair watches for your children or older adults without an iPhone using Family Setup.

Technology
Blood oxygen sensor
Electrical heart sensor
Third-generation optical heart sensor
Temperature sensor
Dual-core S9 SiP
Digital Crown with haptic feedback
L1 GPS
Compass with Waypoints, Backtrack, and new Elevation view
Always-on altimeter
High-g accelerometer
High dynamic range gyroscope
Second-generation speaker and mic
emperature sensing that works with Cycle Tracking. Generate an ECG similar to a single-lead electrocardiogram with the ECG app. Take on-demand readings of your blood oxygen. Crash Detection with advanced sensor-fusion algorithm trained on over 1 million hours of real-world drive and crash data to detect a severe car crash.

Tech Specs
GPS

Case Size and Weight
41mm by 35mm
by 10.7mm (41mm)
31.9 grams (Aluminum, GPS)
32.1 grams (Aluminum, GPS + Cellular)
42.3 grams (Stainless Steel)

Display
41mm
352 by 430 pixels
904 sq mm display area

Features
L1 GPS, GLONASS, Galileo, QZSS, and BeiDou
Compass
Always-on altimeter
Water resistant; 50 meters
Certified IP6X dust resistant
Blood oxygen sensor (Blood Oxygen app)
Electrical heart sensor(ECG app)
Third-generation optical heart sensor
International emergency calling
Emergency SOS
International roaming
High-g accelerometer
Up to 256 g-forces with Fall Detection and Crash Detection
High dynamic range gyroscope
Double tap gesture
On-device Siri
Ambient light sensor
Speaker
Microphone
Apple Pay
GymKit
Capacity 64GB: GPS
Ceramic and sapphire crystal back

Connectivity
Wi-Fi 4
802.11n
Bluetooth 5.3

Power
Built-in rechargeable lithium-ion battery
Up to 18 hours
Up to 36 hours in Low Power Mode

What's in the box
Silver Aluminum Case
Sport Band
Apple Watch Magnetic Fast Charger to USB-C Cable (1 m)