Featuring a 4mm larger screen, combined with an all-new 2000 nits brighter display, Apple Watch Ultra is ready whenever you need. A robust titanium chassis means the watch can withstand the most extreme of temperatures, from -20 to 55 degrees celsius. Experience more accurate workouts with the action button, and seamlessly switch through faces with the new grooved crown. Apple Watch Ultra is more waterproof than ever, with twice the water resistance, a new depth app, and is certified to EN13319. Get more clarity on calls in extreme conditions with the second speaker for increase volume. And, an 86 decibel siren alerts people to your location if you lose your way. Up to 60 hours of extended battery life means you can go wherever your journey takes you.