MULTI DAY BATTERY LIFE — Ultra 4 is a smartwatch with ultramarathon battery stamina, perfect for runners to go the distance — with up to 45 hours of Max Extended Workout tracking. And you can fast charge in just 15 minutes for up to 18 hours of use. STAY CLOSER TO YOUR HEART HEALTH—The most accurate heart rate sensing in a wearable, Ultra 4 now measures HRV as often as every five minutes for insights on stress and recovery, and background heart rate readings every five seconds. A FULL-FEATURED HEALTH TRACKER — Better understand your body with advanced health insights. View your overnight health metrics with the Vitals app and get a daily sleep score, track your menstrual cycle and take readings of your blood oxygen. CHECK YOUR READINESS FOR THE DAY — Know when to rest or put yourself to the test. The readiness experience gives you one clear score and can help you determine your capacity to take on the day by analysing your recent activity, vitals and sleep. ULTIMATE RUNNING AND WORKOUT COMPANION — A superior fitness tracker for distance running, triathlons, mountain biking, strength training and more. Ultra 4 has precision dual-frequency GPS, Pacer, Heart Rate Zones, Custom Workouts, training load and more. KEEP HELP CLOSE AT HAND — A smartwatch that puts your safety first. Ultra 4 can detect a hard fall or serious car crash. If you don’t have mobile service or Wi-Fi, built-in satellite communications let you text emergency services to get help. SIRI AI AND AUDIO INTELLIGENCE — Using just your voice, engage in natural, back and forth conversations, brainstorm ideas and more with Siri AI. Audio Intelligence helps catch what you missed and summarise conversations with Live Rewind and Siri Recap. Siri AI is rolling out in English. Some Audio Intelligence features coming in beta late 2026. Usage limits may apply. RUGGED AND READY TO GO — Ultra 4 is built for extreme environments with a tough titanium case and a strong sapphire crystal display. Water resistant up to 100m, this smartwatch is great for swimmers, divers and fans of high-speed water sports. THE FREEDOM OF CELLULAR — With just your smartwatch, you can take and make calls, stream music and podcasts, and listen with your AirPods — even without your iPhone. LEGAL DISCLAIMERS — This is a summary of the main product features. See below to learn more.
JoybuyEngineered for the extreme, the Apple Watch Ultra 4 in a 49mm Natural Titanium case is the ultimate tool for athletes and adventurers. Featuring a rugged Grade 5 titanium build, a flat sapphire crystal, and 100m water resistance with EN13319 certification for diving to 40m, it's built to endure. At its core, the powerful S11 chip with 64GB storage drives a new Health Sensing System. It captures incredibly precise health data, including background heart rate every 5 seconds and enhanced HRV measurements. The innovative Readiness Score synthesizes your activity and sleep data to provide a clear daily recommendation. The brightest-ever Always-On Retina LTPO3 OLED display (3,000 nits) remains visible in direct sunlight. Stay connected anywhere with GPS + Cellular (5G RedCap, LTE) and off-grid emergency SOS via satellite. The included Sand Trail Loop band is a lightweight, adjustable nylon strap designed for running comfort. With up to 50 hours of battery life and 84 hours in Low Power Mode, the Ultra 4 is ready for your longest expeditions. This is the watch that pushes the limits.
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