Apple Watch Ultra 4 / Apple Watch Ultra 2

Apple Watch Ultra 4: A3579; 49 mm natural titanium; translucent gray Ocean Band

Apple Watch Ultra 2: Apple Watch Ultra 2, 49 mm titanium case, GPS + Cellular; natural (2023) and black titanium added in 2024. Band options (Alpine Loop, Trail Loop, Ocean Band, Titanium Milanese Loop) vary by size. The Apple Watch Ultra (2022) and Ultra 3 (2025) are separate models.

SpecificationApple Watch Ultra 4Apple Watch Ultra 2
Release year20262023
Announcement / availability9 / 18 September 2026 Apple—
CaseGrade 5 titanium; sapphire front crystal Apple49 mm, Grade 5 titanium; natural or black; 49 × 44 × 12 mm

Weight is 61.4 g in natural and 61.8 g in black. Fits 130–210 mm wrists.

Apple
Size49 × 44 × 12 mm Apple—
WeightNatural titanium case 63 g Apple—
DisplayLTPO3 OLED; 422 × 514 AppleAlways-On Retina LTPO2 OLED; 410 × 502 pixels, 326 ppi; 1,185 mm² display area

Brightness goes up to 3,000 nits and down to 1 nit in the dark. LTPO2 lowers the refresh rate to reduce battery use in always-on mode.

Apple
Brightness1 nit minimum; 3000 nits peak Apple—
ChipS11; dual-core 64-bit Apple—
Storage64 GB Apple—
Health sensorsElectrical/optical heart; blood oxygen; temperature Apple—
Outdoor sensorsDepth, water temperature, compass, altimeter Apple—
PositioningPrecision dual-frequency GNSS Apple—
WirelessWi-Fi 4, 2.4/5 GHz; Bluetooth 5.3; UWB Apple—
CellularA3579: 5G RedCap and LTE Apple—
Manufacturer battery testUp to 50 hours normal use; 84 in Low Power Mode Apple—
ChargingAbout 45 minutes to 80% Apple—
Water / dust100 m rating; IP6X Apple—
Diving limitRecreational diving to 40 m Apple—
Phone compatibilityiPhone 11 / SE 2 or later; iOS 27+ Apple—
Glass—Flat sapphire crystal front Apple
Chip and storage—S9 SiP (64-bit dual-core processor, 4-core Neural Engine); 64 GB

The S9 SiP can process Siri requests on the device and supports the double tap gesture (tapping thumb and index finger together twice).

Apple
Location—L1 + L5 dual-frequency GPS; GLONASS, Galileo, QZSS, BeiDou

The L5 band helps reduce position errors where signals bounce, such as among tall buildings and dense trees.

Apple
Sensors—Electrical heart sensor; third-generation optical heart sensor; temperature sensor; depth gauge; water temperature sensor; compass; always-on altimeter

The electrical sensor runs the ECG app (age 22 and over). The temperature sensor is not for medical use; it supports retrospective ovulation estimates in cycle tracking.

Apple
Diving and durability—100 m water resistance under ISO 22810:2010 (WR100); recreational scuba diving to 40 m under EN13319; IP6X under IEC 60529; MIL-STD 810H testing

The depth gauge is accurate to ±1 m; Apple advises against diving below 40 m. The MIL-STD 810H tests cover altitude, temperature shock, freeze/thaw, shock and vibration.

Apple
Cellular and wireless—4G LTE and UMTS; Wi-Fi 4 (802.11n); Bluetooth 5.3; second-generation Ultra Wideband chip

Cellular use needs a carrier plan. Ultra Wideband enables precision finding of an iPhone; availability depends on the country.

Apple
Battery and charging—Up to 36 hours in normal use and 72 hours in Low Power Mode; fast charge to 80% in about 1 hour; built-in lithium-ion

The box includes a 1 m magnetic fast charger to USB-C cable; no adapter.

Apple
Controls and safety—Customisable Action button; Digital Crown with haptic feedback; siren; Emergency SOS, fall and crash detection

The Action button is also used for Precision Start, beginning a workout recording at the exact start. The siren sounds a loud alert to call for help.

Apple
Compatibility—iPhone Xs or later, or iPhone SE (2nd generation or later), with iOS 18 or later

The watch is set up and used only with an iPhone; it does not work with Android phones.

Apple
Operating conditions—On wrist –20 to 55 °C; diving 0–40 °C; altitude –500 to 9,000 m Apple