Apple Watch Ultra

49mm aerospace-grade titanium case architecture

High-durability enclosure featuring a raised perimeter lip designed to protect the edges of the flat sapphire front crystal from direct lateral impacts.

Flat sapphire crystal front face

Replaces the curved-edge glass/crystal design of the Series line with a completely flat sapphire crystal surface to maximize edge impact resistance.

Enlarged Digital Crown with protective crown guard

Digital Crown increased in diameter with deeper, coarser grooves and housed within a raised side guard structure for easy tactile operation while wearing heavy gloves.

Customizable physical Action button

Customizable physical Action button

*Hardware implementation*

A dedicated, high-contrast international orange tactile button positioned on the left side of the case, mechanically optimized for positive tactile feedback with gloves or in wet conditions.

*Software functionality*

Configurable in watchOS to instantly trigger workouts, mark workout intervals or segments, set Compass Waypoints, initiate Backtrack, activate the Flashlight, open diving apps, or execute custom Shortcuts. A sustained hold triggers the 86dB emergency siren.

Precision dual-frequency GPS (L1 + L5 GNSS)

Precision dual-frequency GPS (L1 + L5 GNSS)

*Hardware implementation*

Combines both L1 and L5 GPS frequencies with a new antenna architecture integrated directly into the titanium bezel.

*Software functionality*

Advanced positioning algorithms fuse satellite signals with watchOS map data to deliver accurate distance, pace, and route metrics in high-density urban canyons and dense tree canopy where standard GPS signals suffer multipath interference.

86-decibel Emergency Siren

86-decibel Emergency Siren

*Hardware implementation*

Dual-speaker sound system capable of generating an 86dB acoustic signal audible up to 600 feet (180 meters).

*Software functionality*

Plays two distinct high-pitched distress patterns in alternation (one distress pattern, one universal SOS pattern) that repeat for hours.

Dual-speaker audio and three-microphone array

Two speakers provide significantly louder call volume and audio prompts; three beamforming microphones use adaptive algorithms to suppress severe wind noise for voice clarity in outdoor gale conditions.

2,000 nits peak display brightness

Reaches up to 2,000 nits—twice the peak brightness of any previous Apple Watch—for direct sunlight legibility in deserts, snowfields, and open water.

Wayfinder watch face with Night Mode

(minor): Designed specifically for the larger display, integrating a live compass ring; rotating the Digital Crown turns the entire interface red to preserve dark-adapted night vision.

WR100 water resistance and EN13319 dive computer compliance

WR100 water resistance and EN13319 dive computer compliance

*Hardware implementation*

Water-resistant to 100 meters (ISO standard 22810:2010); certified to EN13319 internationally recognized standard for diving accessories; incorporates a dedicated depth gauge and water temperature sensor.

*Software functionality*

Native Depth app automatically launches upon submersion to display depth down to 40 meters (130 feet), dive time, and water temperature. Integration with the third-party Oceanic+ app enables recreational scuba diving calculations using the Bühlmann decompression model.

36-hour normal battery life

Doubled the battery longevity standard from the traditional 18-hour Series benchmark to 36 hours of normal use, with up to 60 hours in Low Power Mode with reduced sensor sampling.

Extreme operating temperature envelope

Operational temperature range on-wrist from -20°C to 55°C (-4°F to 130°F); tested against MIL-STD 810H standards for low pressure (altitude), high/low temperature, temperature shock, contamination, humidity, immersion, freeze/thaw, shock, and vibration.

Specialized activity straps

(minor): Debuted Trail Loop (lightweight pull-tab weave for endurance runners), Alpine Loop (seamless dual-layer weave with titanium G-hook for climbers), and Ocean Band (molded fluoroelastomer with titanium buckle for water sports).

S8 SiP processing architecture

Shares the dual-core 64-bit S8 processor and internal system bus with Series 8.

Dual-sensor wrist temperature sensing

Incorporates both the back crystal temperature sensor and the display sensor for nightly sampling and retrospective ovulation estimates.

Crash Detection safety array

Integrates the 256g high-g accelerometer and HDR gyroscope to support automotive crash detection.

Health monitoring suite

Retained electrical heart sensor (ECG app), third-generation optical heart sensor, and Blood Oxygen (SpO2) sensor.

Band lug backward compatibility

Despite the 49mm case scale, the lug mechanism retains mechanical compatibility with standard 44mm and 45mm Apple Watch bands.