DisplaySpecifications: 410 x 502px, 1185mm sq display area. Display Brightness: Always-On Retina LTPO OLED, up to 2000 nits brightness. Chips: S8SiP with 64-bit dual-core process, W3 wireless chip, U1 chip ultra wideband. Storage: 32GB. The Ultra comes in Apple's usual minimalist white packaging. AlwaysOn Retina display Up to 2000 nits. S9 SiP. Double tap gesture. Faster on-device Siri. Precision Finding for iPhone 10. Blood Oxygen app 3. ECG app 4. High and low heart Apple Watch Ultra 2, Apple Watch Series 9 and Apple Watch SE require iPhone Xs or later with iOS 17 or later. Features are subject to change. Some features Italso has the brightest screen of any Apple Watch, as it can reach a maximum brightness of 3,000 nits. That's 50% brighter than the original Ultra. The difference was negligible indoors, but TheApple Watch Ultra has much longer battery life than the Apple Watch Series 8 and S, lasting up to 36 hours in normal use, and up to 60 hours in low power mode with workout settings enabled. Not having to charge your watch daily is a real bonus for outdoor expeditions, but rival devices like the Garmin Enduro 2 and Instinct 2 can last Display Always-On Retina LTPO OLED display; Flat sapphire crystal display; Up to 3000 nits maximum brightness; 1 nit minimum brightness; Apple Watch Ultra 2, Apple Watch Series 9, and Apple Watch SE require iPhone Xs or later with iOS 17 or later. Features are subject to change. Some features, applications, and services may AlwaysOn Retina display Up to 2000 nits. S9 SiP. Double tap gesture. Faster on-device Siri with health data access. Precision Finding for iPhone. Blood Oxygen app 7. ECG app 5. High and low heart Apple Watch Ultra 2 has a water resistance rating of 100 meters under ISO standard 22810. It may be used for recreational scuba diving (with WatchSeries 9 and Watch Ultra 2 after a one-week halt over patent dispute with Masimo. The ITC said that Apple's argument was based on US Customs and AlwaysOn Retina LTPO OLED display Flat sapphire crystal display Up to 3000 nits maximum brightness 1 nit minimum brightness Chip: S9 SiP with 64-bit dual-core Appledefines "normal" use for the 36 hour metric as 180 time checks, 180 notifications, 90 minutes of app use, and a 60-minute workout with music playback from Apple Watch Ultra via Bluetooth Weunderstand that you've already checked the display brightness on your Apple Watch Ultra, and it's still dimming on it's own. This may be due to the Always On feature. This isn't available on Apple Watch Series 3, so that may explain the difference you're seeing. Use the Always On feature with your Apple Watch has more information 1VTucf.