Screen size:49mm case Style :Classic Shape:rectangular Aerospace grade titanium Dual speakers Three-microphone array with beamforming and wind noise mitigation Customizable Action button Digital Crown with haptic feedback Side button Double tap gesture^ On-Device Siri^ Always-On Retina LTPO OLED display Flat sapphire crystal display Up to 3000 nits maximum brightness 1 nit minimum brightness S9 SiP with 64-bit dual-core processor 4-core Apple Neural Engine 64GB capacity Blood oxygen sensor and app3 Electrical heart sensor and ECG app4 Third-generation optical heart sensor High and low heart rate notifications4 Irregular rhythm notifications5 Sleep stages Temperature sensing6 Depth gauge ±1m accuracy Water temperature sensor Compass Always-on altimeter High-g accelerometer Up to 256 g-forces with Fall Detection and Crash Detection High dynamic range gyroscope Ambient light sensor Emergency SOS8 International emergency calling9 Siren Crash Detection8 Fall Detection8 Water resistance 100m (swim proof)12 Dust resistance IP6X19 EN13319 recreational scuba diving to 40m12 Tested to MIL-STD 810H: altitude, high temperature, low temperature, temperature shock, immersion, freeze with thaw, ice and freezing rain, and shock and vibration.20 Precision dual-frequency GPS: GPS, GNSS, Galileo, and BeiDou LTE and UMTS13 Wi-Fi 4 (802.11n) Bluetooth 5.3 Second-generation Ultra Wideband chip21 Apple Pay GymKit Built-in rechargeable lithium-ion battery Up to 36 hours18 Up to 72 hours in Low Power Mode18 USB-C magnetic fast charging cable 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)
