WHY APPLE WATCH ULTRA - Rugged and capable, built to meet the demands of endurance athletes, outdoor adventurers, and water sports enthusiasts - with a specialized band for each. Up to 36 hours of battery life, plus all the Apple Watch features that help you stay healthy, safe, and connected. | EXTREMELY RUGGED, INCREDIBLY CAPABLE - 49mm corrosion-resistant titanium case. Larger Digital Crown and more accessible buttons. 100m water resistance. Customizable Action button for instant physical control over a variety of functions. | BIGGEST, BRIGHTEST DISPLAY YET- A bright Always-On Retina display that’s easy to see, even in direct sunlight. More room for adding complications to customize your watch face. | FOR ENDURANCE ATHLETES - Advanced metrics in the Workout app, including Heart Rate Zones and Running Form. Precision dual-frequency GPS for accuracy, distance, route, and pace calculations. Trail Loop band is thin, light, and flexible, designed especially for runners. | FOR OUTDOOR ADVENTURERS - Redesigned Compass app delivers all-new views and functionality. Mark your location with Compass Waypoints. Backtrack uses GPS to map where you’ve been so you can retrace your steps. Alpine Loop band is extremely rugged and secure to meet the needs of hikers and climbers. | FOR WATER SPORTS ENTHUSIASTS - Made for high-impact water sports and diving. The Oceanic+ app puts a dive computer on your wrist. Ocean Band is light and flexible, with a titanium buckle and adjustable loop for a secure fit even during high-speed water sports. | MOST ADVANCED HEALTH AND SAFETY FEATURES - Advanced health sensors give you deep insights into your health. Fall Detection and Crash Detection can automatically connect you with emergency services in the event of a hard fall or a severe car crash. Hold the Action button to activate a siren that can be heard up to 600 feet away. | APPS ON YOUR WRIST - With access to tens of thousands of apps on the App Store right on your wrist, Apple Watch is the perfect personal device for whatever you love to do. | THE FREEDOM OF CELLULAR - Cellular is built into every model. You can call and text without your iPhone, even overseas with international roaming. Stream your favorite music and podcasts. Get directions with Maps. | LEGAL DISCLAIMERS - This is a summary of the main product features. See below to learn more.; Water resistance depth: 100.0 meters; water_resistant