The Apple Watch Ultra 2 is the brand's most rugged smartwatch, built from titanium with a flat sapphire-crystal display and a programmable Action Button. The S9 SiP enables Double Tap gestures, while a 49-mm Always-On Retina display peaks at 3000 nits for outdoor legibility. Dual-frequency GPS, depth gauge to 40 m and an emergency siren make it adventure-ready.