Apple Watch Ultra 4

Processor & Intelligence:

• Processor: Apple S11 64-bit dual-core System in Package (SiP)

• Neural Engine: 4-core Apple Neural Engine dedicated to on-device Apple Intelligence

• Storage Capacity: 64GB internal flash memory

• Operating System: watchOS (optimized with Apple Intelligence features)

Materials, Case & Durability:

• Case Size: 49mm (fits wrist circumferences from 130mm to 210mm)

• Case Construction: Aerospace-grade titanium chassis with raised edge screen protection

• Crystal Cover: Completely flat sapphire crystal front glass

• Color Finishes: Natural Titanium & Black Titanium

• Water Resistance: WR100 (100 meters / 330 feet) | Recreational diving to 40m (EN13319)

• Environmental Standards: IP6X dust resistance certified | MIL-STD 810H military shock/vibration/temperature testing

Display:

• Screen Type: Always-On Retina display with wide-angle OLEDs and LTPO3 technology

• Resolution: 422 × 514 pixels (326 ppi | 1,245 sq mm viewing area)

• Brightness Levels: 3,000 nits peak outdoor brightness | 1 nit minimum brightness in low light

• Night Mode: Crimson Night Mode for Modular Ultra, Wayfinder, and Orienteering dials

Sensors & Navigation:

• Satellite Navigation: Precision dual-frequency GPS (L1 & L5), GLONASS, Galileo, QZSS, BeiDou

• Marine Sensors: Depth gauge accurate to ±1m | Water temperature sensor

• Cardiac Sensors: Second-generation electrical heart sensor (ECG app) | Always-on optical heart sensor

• Health & Environmental Sensors: Blood oxygen sensor, wrist temperature sensor, always-on altimeter, compass with Waypoints & Backtrack, high-g accelerometer (up to 256 Gs), high dynamic range gyroscope, ambient light sensor

Audio, Controls & Safety:

• Physical Controls: Customizable Action button (International Orange), Digital Crown with haptic feedback, Side button

• Gesture Controls: Double Tap gesture, single tap, wrist flick motion control

• Audio Suite: 3-microphone array with beamforming & wind-noise suppression | Dual amplified speakers

• Emergency Siren: 86-decibel sound signal emitting distress pattern audible up to 600 ft / 180 m

• Safety Systems: Crash Detection, Fall Detection, Emergency SOS, Medical ID

Battery & Power:

• Normal Usage Battery Life: Up to 50 hours

• Low Power Mode: Up to 72 hours

• Fast-Charging: 15 minutes of magnetic fast charge provides up to 18 hours of normal use

• Charging Interface: Magnetic Fast Charger to USB-C Cable

Connectivity:

• Cellular: LTE and UMTS (eSIM connectivity)

• Wireless: Wi-Fi 4 (802.11n, dual-band 2.4GHz & 5GHz) | Bluetooth 5.3 Low Energy | NFC with Apple Pay | GymKit

Dimensions & Weights:

• Height: 49 mm

• Width: 44 mm

• Depth: 12 mm

• Weight: Natural Titanium: 63.0 grams | Black Titanium: 63.1 grams

Is the Apple Watch Ultra 4 suitable for scuba diving in Grand Cayman?

Absolutely. The Apple Watch Ultra 4 is EN13319 certified (the international standard for dive computers and depth accessories) and is water-resistant up to 100 meters (WR100). It features a dedicated depth gauge accurate to 40 meters (130 feet) and a real-time water temperature sensor. When paired with the Oceanic+ app from the App Store, it becomes a comprehensive dive computer complete with decompression limits, ascent rates, and surface interval calculations.

How long does the battery last, and how fast does it recharge?

The Apple Watch Ultra 4 provides up to 50 hours of normal operation on a single charge and up to 72 hours when using Low Power Mode. With upgraded magnetic fast charging, just 15 minutes on the charger restores up to 18 hours of battery life—making it easy to top up before a morning workout or dive session.

What is the benefit of the customizable Action button?

The international orange Action button on the left side of the watch provides instant tactile access to essential functions without touching the screen. You can customize it to start an open-water swim, record track intervals, set a compass waypoint, trigger the flashlight, launch a dive session, or press and hold it to sound the 86-decibel emergency siren.