Material and Finish
Aluminum case
Starlight, Midnight
Size and Weight

Height: 40mm
Width: 34mm
Depth: 10.7mm
324 by 394 pixels
759 sq mm display area
Weight (GPS): 26.3 grams
Weight (GPS + Cellular): 26.4 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
Double tap and wrist flick gestures
Siri with on-device processing

Chip
S10 chip with 64-bit dual core processor
4-core Neural Engine
64GB capacity
Sensors
Second-generation optical heart sensor
Temperature sensor
Compass
Always-on altimeter
High-g accelerometer
High dynamic range gyroscope
Ambient light sensor
Health and Wellness
Cycle Tracking app with retrospective ovulation estimates
Heart Rate app
High and low heart rate notifications
Irregular rhythm notifications3
Medications app
Mindfulness app
Noise app
Sleep app including sleep stages
Sleep score
Sleep apnea notifications4

Display
Always-On Retina display with OLED and LTPO
Tough Ion-X front glass with 4x crack resistance
Up to 1000 nits peak brightness
2 nits minimum brightness
326 pixels per inch
Audio
Speaker
Microphone
Media playback
Power and Battery Life
All-day battery life, up to 18 hours of normal use
Up to 32 hours in Low Power Mode
Built-in rechargeable lithium-ion battery
Fast-charge capable7
Up to 80% charge in about 45 minutes
15 minutes for up to 8 hours of normal use
8 minutes for up to 8 hours of sleep tracking

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.
Workouts and Activity
Running
Custom workouts
Customizable Workout Views
Training Load
Heart Rate Zones
Race Route
Pacer
Stride Length, Ground Contact Time, and Vertical Oscillation
Automatic track detection
Multisport workout

Hiking
Compass with bearing, incline, elevation, and coordinates
Custom waypoints
Automatically generated waypoints to cellular connectivity
Backtrack GPS data
Offline maps with custom route creation
Topographic maps for thousands of national and regional parks (U.S. only)
Hundreds of curated hikes across all 63 U.S. national parks

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
Custom workouts for pool swims
Splits and auto sets
SWOLF score
Automatic stroke detection
Kickboard detection
Average pace, total distance, and laps

More Workouts
Skiing
Snowboarding
Outdoor Rowing
Paddling
Golf
Walk
Elliptical
Rower
Stair Stepper
HIIT
Yoga
Functional Stength Training
Dance
Cooldown
Core Training
Pilates
Tai Chi
Wheelchair
Kickboxing
Multisport
Other
Safety
Emergency SOS9
International emergency calling
Crash Detection9
Fall Detection
Noise monitoring
Backtrack
Durability
Water resistance 50m (swimproof)
Connectivity
L1 GPS, GNSS, Galileo, and QZSS
5G12 and LTE13
Wi-Fi 4 (802.11n)
Support for 2.4GHz Wi-Fi networks
Bluetooth 5.3
Apple Pay14
GymKit
Support for Apple Watch For Your Kids
International roaming16
Accessibility
Built-in accessibility features supporting vision, mobility, hearing, and cognitive disabilities.
Learn more
Features include:
VoiceOver
Zoom
On/Off Labels
Reduce Transparency
Increase Contrast
Color Filters
Text Size
Bold Text
Reduce Motion
Hourly Chimes
AssistiveTouch
Button Click Speed
Touch Accommodations
Auto-Answer Calls
Type to Siri
RTT Support
Audio Volume Balance
Auto Transcription
Live Speech
Accessibility Shortcut
Mono Audio
Taptic Time
Personal Voice
Live Listen
Environmental Requirements
Operating temperature:
32 to 95 F (0 to 35 C)
Nonoperating storage temperature:
-4 to 113 F (-20 to 45 C)
Relative humidity:
5% to 90% noncondensing
Operating altitude:
0 feet to 10,000 feet (0m to 3000m)

Apple Watch
and the Environment
Apple Watch SE 3 is designed to reduce environmental impact:

Progress toward Apple 2030
Apple 2030 is our commitment to be carbon neutral for our entire carbon footprint. Our plan to decarbonize products is rigorous and focuses on transitioning to low-carbon electricity, designing with recycled and low-carbon materials, and prioritizing lower-carbon ways of shipping products, like ocean freight.
See Apple's commitment
Materials

Apple Watch SE 3 is made with 40% recycled content,18 including:
100% recycled aluminum in the case
100% recycled cobalt and 95% recycled lithium in the battery
100% recycled rare earth elements in all magnets
100% recycled gold plating and tin solder in all Apple-designed printed circuit boards
100% recycled tungsten in the Taptic Engine
40% recycled glass in the display glass

Energy
100% of manufacturing electricity for Apple Watch SE 3 is sourced from renewable electricity
100% of expected customer energy use matched with low-carbon electricity
Meets California Energy Commission's energy efficiency standards for battery charger systems

Packaging
100% fiber-based packaging
Apple Watch SE 3 packaging is designed to be compact, enabling 40% more units per trip compared to Apple Watch SE
Waste

No established final assembly sites generate waste sent to landfill as part of Apple's Zero Waste Program
Smarter chemistry

All of the materials used in Apple products, accessories, and packaging are covered by the requirements of our Regulated Substances Specification, which was one of the first in industry to restrict the use of key substances of concern. See the latest Environmental Progress Report to understand Apple's recent efforts in phasing out these chemistries.

Compatibility
iPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 26 or later

What's in the box
Apple Watch SE 3
Band
Apple Watch Magnetic Fast Charger to USB-C Cable (1m)