Display Always-On Retina display The largest display, with up to 3000 nits of brightness – the brightest display Apple has ever designed. Large enough to see up to six lines of workout metrics at a glance. Readable even in direct sunlight. Always-On technology keeps the display on so you can see key information at a glance. The new exclusive Modular Ultra watch face is easily customizable and shows real-time altitude, depth, or second on the outermost edges, and Night Mode can activate automatically in the dark. 410 by 502 pixels 49mm 410 by 502 pixels 1185 sq mm display area Chip S9 SiP with 64-bit dual-core processor W3 Apple wireless chip Second-generation Ultra Wideband chip 4-core Neural Engine Materials and Finishes Titanium Made with 95% recycled aerospace-grade titanium for the perfect balance between weight, ruggedness, and corrosion resistance. Case designed with raised edges to protect the flat sapphire front crystal from edge impacts. Super rugged to withstand the elements. Health and Wellness Blood Oxygen app ECG app High and low heart rate notifications Irregular rhythm notifications Sleep stages Mental wellbeing Cycle Tracking with retrospective ovulation estimates Log your state of mind in the Mindfulness app and get insights into your mental health. Temperature sensing works with Cycle Tracking to help you better understand your menstrual cycle. Measure your blood oxygen levels, take an ECG from your wrist,5 be alerted if it detects unusually high or low heart rates or an irregular rhythm, measure your current heart rate. And learn more about your time asleep with sleep stages. Controls Double tap gesture Faster on-device Siri with health data access Digital Crown with haptic feedback Side button Customizable Action button Cellular Connectivity Cellular connectivity on GPS Cellular model Cellular connectivity waypoints Supports Family Setup International roaming Cellular connectivity comes standard. With an active cellular plan, make calls, send texts, stream music, and make emergency calls without your iPhone nearby. Pair watches for your children or older adults without an iPhone using Family Setup. Technology Blood oxygen sensor Electrical heart sensor Third-generation optical heart sensor Temperature sensor Dual-core S9 SiP Digital Crown with haptic feedback Customizable Action button Precision dual-frequency (L1 and L5) GPS Compass with Waypoints, Backtrack, and new Elevation view Always-on altimeter High-g accelerometer High dynamic range gyroscope Depth gauge and water temperature sensor Depth app (preinstalled) Dive computer app (available on the App Store) Dual speakers and three-mic array with beamforming Customizable Action button to begin a workout, turn on your flashlight, and more. Amazing GPS accuracy even in urban settings. Compass app with Backtrack, Waypoints, and new Elevation view for easier navigation. A depth gauge that activates automatically when you submerge. Generate an ECG similar to a single-lead electrocardiogram with the ECG app. Take on-demand readings of your blood oxygen. Crash Detection with advanced sensor-fusion algorithm trained on over 1 million hours of real-world drive and crash data to detect a severe car crash. Siren attracts attention to your location. Tech Specs GPS Cellular Case Size and Weight 49mm by 44mm by 14.4mm 61.4 grams Features L1 and L5 GPS, GLONASS, Galileo, QZSS, and BeiDou Compass Always-on altimeter with expanded operating range from -500m to 9000m Water resistant 100 meters Certified IP6X dust resistant Tested to MIL-STD 810H Blood oxygen sensor (Blood Oxygen app) Electrical heart sensor Third-generation optical heart sensor International emergency calling International roaming High-g accelerometer Up to 256 g-forces with Fall Detection and Crash Detection High dynamic range gyroscope Double tap gesture On-device Siri Ambient light sensor Water temperature sensor Depth gauge and Depth app Dive ready to 40m / 130 ft. EN13319 certification Oceanic app for use as a dive computer (available on the App Store) Dual speakers Siren Three-microphone array with beamforming and wind noise mitigation Apple Pay GymKit Capacity 64GB GPS Cellular Ceramic and sapphire crystal back GPS Cellular Connectivity LTE and UMTS14 GPS Cellular model Wi-Fi 4 802.11n Bluetooth 5.3 Power Built-in rechargeable lithium-ion battery Up to 36 hours18 Up to 72 hours in Low Power Mode USB-C magnetic fast charging cable What’s in the box 1 x Titanium Case 1 x Ocean Band 1 x Apple Watch Magnetic Fast Charger to USB-C Cable (1m)