<p>Key features of the Apple Watch Ultra include:</p><ul><li>Design and Durability:</li></ul><p>It features a 49mm aerospace-grade titanium case, known for its balance of weight, ruggedness, and corrosion resistance. </p><ul><li>Display:</li></ul><p>It boasts a large, bright Always-On Retina display, ensuring visibility even in bright sunlight. </p><ul><li>Connectivity:</li></ul><p>The GPS + Cellular model allows for staying connected without the need for an iPhone, enabling calls, texts, and streaming. </p><ul><li>Specialized Features:</li></ul><p>It’s equipped with advanced sensors and specialized apps for activities like hiking, running, and diving, including a water resistance rating of 100 meters and EN13319 certification for recreational scuba diving to 40 meters. </p><ul><li>Battery Life and Action Button:</li></ul><p>It offers extended battery life and includes a new customizable Action button for quick access to various functions. </p>