<p data-start="386" data-end="894">The Xiaomi Watch S4 in <strong data-start="409" data-end="428">Rainbow edition</strong> brings together elegant aesthetics and powerful functionality, making it perfect for both everyday wear and active lifestyles. Featuring a <strong data-start="568" data-end="596">1.43-inch AMOLED display</strong> with stunning 2,200 nits peak brightness, it delivers vivid visuals, crisp details, and exceptional outdoor visibility. Its <strong data-start="721" data-end="783">customizable design with interchangeable bezels and straps</strong>, paired with the stylish Rainbow finish, gives it a fashion-forward appearance while maintaining practicality.</p> <p data-start="896" data-end="1347">Designed for smart connectivity, the Watch S4 supports <strong data-start="951" data-end="972">Bluetooth calling</strong> with <strong data-start="978" data-end="1009">advanced AI noise reduction</strong>, ensuring crystal-clear conversations even in noisy environments. The classic <strong data-start="1088" data-end="1106">rotating crown</strong> allows smooth navigation through menus, apps, and notifications, providing a traditional watch feel with modern smart technology. It also includes NFC support for quick and secure contactless payments, making everyday usage more convenient.</p> <p data-start="1349" data-end="1816">On the health front, the Xiaomi Watch S4 offers <strong data-start="1397" data-end="1432">comprehensive wellness tracking</strong>, including <strong data-start="1444" data-end="1550">24-hour heart rate monitoring, SpO₂ blood oxygen detection, advanced sleep analysis, stress monitoring</strong>, and guided breathing exercises. With <strong data-start="1589" data-end="1610">150+ sports modes</strong>, it accurately tracks fitness activities while giving insights into calorie burn, distance, pace, and workout intensity. Its robust sensors help monitor body performance across indoor and outdoor workouts.</p> <p data-start="1818" data-end="2132">Battery longevity is another standout feature, providing <strong data-start="1875" data-end="1920">up to 15 days of usage on a single charge</strong>, and a quick <strong data-start="1934" data-end="1982">5-minute charge delivers up to 2 days of use</strong>. Lightweight, durable, stylish, and smart—the Xiaomi Watch S4 Rainbow is built to enhance your lifestyle, fitness journey, and everyday productivity.</p>