Tech Specs
Material and Finish
Titanium case, Grade 5
Natural, Black
Size and Weight
Height: 49mm
Width: 44mm
Depth: 12mm
422 by 514 pixels
1245 sq mm display area
Weight (natural): 63.0 grams
Weight (black): 63.1 grams
Fits 130–210mm wrists
Hardware and Buttons
- Microphone
- Speaker
- Health Sensing System
- Customizable Action button
- Siren/Speaker
- Antennas (GPS, cellular/satellite)
- Microphone
- Side button
- Microphone
- Digital Crown
- Depth gauge/Water temperature sensor/Altimeter
Controls
Customizable Action button
Digital Crown with haptic feedback
Side button
Single tap, double tap, and wrist flick gestures
Siri powered by Apple Intelligence
Chip
S11 chip with 64-bit dual-core processor
Audio Intelligence (Live Rewind, Siri Recap, Shazam, Sound Recognition)
4-core Neural Engine
64GB capacity
Sensors
Health Sensing System: second‑generation electrical heart sensor, always‑on optical heart sensor, blood oxygen sensor,3 and temperature sensor.
Depth gauge
Water temperature sensor
Compass
Always‑on altimeter
High‑g accelerometer
High dynamic range gyroscope
Ambient light sensor
Health and Wellness
Readiness app
Vitals app with heart rate, respiratory rate, wrist temperature, sleep duration, and heart rate variability (HRV)
Blood Oxygen app
ECG app
Heart Rate app
High and low heart rate notifications
Recovery HRV
High‑frequency background heart rate tracking
Irregular rhythm notifications
Advanced Cycle Tracking app with fertile window estimates, retrospective ovulation estimates, and perimenopause and menopause support
Medications app
Mindfulness app with state of mind tracking
Noise app
Sleep app including sleep stages
Sleep score
Sleep apnea notifications
Hypertension notifications
Display
Always‑On Retina display with wide‑angle OLEDs and LTPO3
1Hz refresh
Active area 422 by 514 pixels, 326 pixels per inch
Flat sapphire crystal display
3000 nits peak brightness
1 nit minimum brightness
Night Mode for Apple Watch Ultra faces (Modular Ultra, Wayfinder, Orienteering)
Audio
Three-microphone array with beamforming and wind noise mitigation
Dual speakers
Media playback
Siren
Power and Battery Life
Multiday battery life, up to 50 hours of normal use
Up to 84 hours in Low Power Mode
Up to 18 hours workout tracking
Up to 25 hours Extended Workout tracking
Up to 45 hours Max Extended Workout tracking
Built‑in rechargeable lithium‑ion battery
Fast‑charge capable
Up to 80% charge in about 45 minutes
15 minutes for up to 18 hours of normal use
5 minutes for up to 10 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 / Workout Effort Tracking
Heart Rate Zones (customizable)
Postworkout heart rate
VO2 max
Race Route
Pacer
Precision Start using Action button
Cadence, Stride Length, Ground Contact Time, Vertical Oscillation, and Running Power
Automatic track detection
Multisport workout
Heart Rate Zone, pace, and target alerts
Hiking
Compass with bearing, incline, elevation, and coordinates
Custom waypoints
Automatically generated waypoints to cellular connectivity
Backtrack GPS data
Offline maps with custom route creation16
Elevation alerts
Topographic maps for thousands of national and regional parks (U.S. only)
Hundreds of curated hikes across all 63 U.S. national parks
Siren
Cycling
Custom workouts
Customizable Workout Views
Training Load / Workout Effort Tracking
Average speed, elevation gained, and distance
Bluetooth-compatible with power meters
Functional Threshold Power (with power meter connection)
Live Activity on iPhone
Heart Rate Zones (customizable)
Cadence (rpm), speed (mph), power (watts), power zones (with power meter connection)
Postworkout heart rate
Swimming
Custom workouts (pool swim) with haptics to cue the next interval
Customizable Workout Views (pool swim, open water swim)
Splits and auto sets
SWOLF score
Automatic stroke and count detection (including kickboard)
Water temperature
Average pace, total distance, heart rate, and laps
Diving
Recreational dive to 40m
Dive computer app (available on the App Store)17
Automatic launch at 1m
Current and maximum depth duration
GPS entry and exit points
Depth gauge
Water temperature sensor
More Workouts
Skiing | Snowboarding | Outdoor Rowing | Paddling | Golf | Walk | Elliptical | Rower | Stair Stepper | HIIT | Yoga | Functional Strength Training | Dance | Cooldown | Core Training | Pilates | Tai Chi | Wheelchair | Kickboxing | Multisport | Other
Safety
Satellite communications (Emergency SOS, Messages, Find My)
Emergency SOS
International emergency calling
Siren
Flashlight
Fall Detection
Crash Detection
Last Emergency Call Availability Waypoint
Noise monitoring
Backtrack
Check In
Durability
Water resistance 100m (swim, snorkel, scuba, high-speed water sports) under ISO standard 22810:2010
Dust resistance IP6X under IEC 60529
EN13319 recreational scuba diving to 40m (±1m accuracy)
Tested to MIL-STD 810H against subsections for altitude, high temperature, low temperature, temperature shock, immersion, freeze with thaw, ice and freezing rain, and shock and vibration
Connectivity
All Models
Support for 2.4GHz and 5GHz Wi‑Fi networks
Wi‑Fi 4 (802.11n)
Bluetooth 5.3
Precision dual‑frequency GPS (GPS, Galileo, QZSS, and BeiDou)
Second‑generation Ultra Wideband chip
Apple Pay
GymKit
Model A3579
Supports RedCap for 5G25 and LTE
FDD‑5G NR (Bands n1, n2, n3, n5, n7, n8, n12, n14, n20, n25, n26, n28, n66, n71)
TDD‑5G NR (Bands n38, n40, n41, n53)
FDD‑LTE (Bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 66, 71)
TDD‑LTE (Bands 38, 39, 40, 41, 53)
Support for Apple Watch For Your Kids27
International roaming
Accessibility
Built‑in accessibility features supporting vision, mobility, hearing, and cognitive disabilities.
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
- Audio Transcription
- Live Speech
- Accessibility Shortcut
- Mono Audio
- Taptic Time
- Personal Voice
- Live Listen
- Sound Recognition
Environmental Requirements
On-wrist operating temperature: –4° to 130° F (–20° to 55° C)
Operating temperature: 32° to 95° F (0° to 35° C)
Non-operating storage temperature: –4° to 113° F (–20° to 45° C)
Dive operating temperature: 32° to 104° F (0° to 40° C)
Relative humidity: 5% to 90% noncondensing
Operating altitude: –1600 feet to 29,500 feet (–500m to 9000m)
Compatibility
iPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 27 or later
In the Box
Apple Watch Ultra 4
Band
Apple Watch Magnetic Fast Charger to USB‑C Cable (1m)
