Apple Watch Ultra 4 / Samsung Galaxy Watch5 Pro (45 mm)

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

Samsung Galaxy Watch5 Pro (45 mm): The Galaxy Watch5 Pro comes in one size (45 mm): SM-R920 (Bluetooth) and SM-R925 (LTE), in Black Titanium and Gray Titanium. The 40/44 mm Galaxy Watch5 is a separate model with a different battery, case material and display size.

SpecificationApple Watch Ultra 4Samsung Galaxy Watch5 Pro (45 mm)
Release year20262022
Announcement / availability9 / 18 September 2026 Apple—
CaseGrade 5 titanium; sapphire front crystal Apple—
Size49 × 44 × 12 mm Apple—
WeightNatural titanium case 63 g Apple—
DisplayLTPO3 OLED; 422 × 514 Apple1.4-inch (34.6 mm) 450 × 450 Super AMOLED; full-colour Always On Display

The bezel is raised above the display, which Samsung designs to protect the glass from knocks. There is no rotating bezel; menus are navigated with touch gestures and the buttons.

Samsung
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+ AppleAndroid 8.0 or higher with more than 1.5 GB of RAM Samsung
Glass and case—Sapphire Crystal; titanium case with D-Buckle Sport Band

The D-buckle band folds open; because the watch cannot lie flat, it is charged on its side on the Samsung charger.

Samsung
Processor—Exynos W920, dual-core 1.18 GHz Samsung
Memory and storage—1.5 GB RAM + 16 GB internal storage Samsung
Battery and charging—590 mAh (typical); WPC-based wireless faster charging

Samsung says real battery life varies with network environment and usage patterns. 590 mAh is about 44% larger than the 410 mAh battery in the 44 mm Galaxy Watch5.

Samsung
Operating system—Wear OS 3.5 (Powered by Samsung) with One UI Watch 4.5 at launch

Activation requires connecting to an Android phone with Google Mobile Services; it cannot be used with an iPhone.

Samsung
Sensors—Samsung BioActive Sensor (Optical Heart Rate + Electrical Heart Signal + Bioelectrical Impedance Analysis), temperature, accelerometer, barometer, gyro, geomagnetic, light sensor

Electrical Heart Signal enables ECG and Bioelectrical Impedance enables body composition estimates; ECG works through the Samsung Health Monitor app only in approved markets.

Samsung
Connectivity—Bluetooth 5.2, Wi‑Fi 802.11 a/b/g/n 2.4 + 5 GHz, NFC, GPS/Glonass/Beidou/Galileo; LTE (LTE model only)

The LTE model can make calls and use data without the phone nearby; support depends on the carrier.

Samsung
Durability—5ATM + IP68 / MIL-STD-810H

5ATM covers surface water use such as swimming, not diving or high-pressure water. MIL-STD-810H is the US military standard for environmental test methods.

Samsung
Size and weight—45.4 × 45.4 × 10.5 mm; 46.5 g

Dimensions are measured without the health sensors and weight without the strap.

Samsung