Apple Watch Ultra 2 49mm case Aerospace grade titanium Dual speakers Three-microphone array with beamforming and wind noise mitigation Control: Customizable Action button Digital Crown with haptic feedback Side button Double tap gesture On-Device Siri Display: Always-On Retina LTPO OLED display Flat sapphire crystal display Up to 3000 nits maximum brightness 1 nit minimum brightness Chip: S9 SiP with 64-bit dual-core processor 4-core Apple Neural Engine 64GB capacity Sensors: Electrical heart sensor and ECG app Footnote 3 Third-generation optical heart sensor High and low heart rate notifications Footnote 3 Irregular rhythm notifications Footnote 4 Sleep stages Temperature sensing Footnote 5 Depth gauge ±1m accuracy and app Water temperature sensor Compass with Waypoints and Backtrack Always-on altimeter High-g accelerometer High dynamic range gyroscope Ambient light sensor Safety: Emergency SOS Footnote 7 International emergency calling Footnote 8 Siren Crash Detection Footnote 7 Fall Detection Footnote 7 Splash, Water and Dust: Water resistance 100m (swim proof) Footnote 11 Dust resistance IP6X Footnote 18 EN13319 recreational scuba diving to 40m Footnote 11 Tested to MIL-STD 810H: altitude, high temperature, low temperature, temperature shock, immersion, freeze with thaw, ice and freezing rain, and shock and vibration Footnote 19 Connectivity and Communication: Precision dual-frequency GPS: GPS, GNSS, Galileo and BeiDou LTE and UMTS Footnote 12 Wi-Fi 4 (802.11n) Bluetooth 5.3 Second-generation Ultra Wideband chip Footnote 20 Apple Pay GymKit Power and Battery Life: Built-in rechargeable lithium-ion battery Up to 36 hours normal use Footnote 17 Up to 72 hours in Low Power Mode Footnote 17 USB-C magnetic fast charging cable Environmental Requirements: On-wrist operating temperature: -4° F to 130° F (-20° C to 55° C) Operational temperature: 32°F to 95°F (0°C to 35°C) Nonoperational storage temperature: 4°F to 113°F (-20° to 45°C) Dive operating temperature: 32°F to 104°F (0°C to 40°C) Relative humidity: 5% to 90% noncondensing Operating Altitude: -1600 feet to 29,500 feet (-500 m to 9000 m) Dimensions Height: 49mm Width: 44mm Depth: 14.4mm Case Weight: 61.4g