Xiaomi S4 Ultra Smartwatch | AMOLED • GPS • NFC • Bluetooth Calling

Meet the Xiaomi S4 Ultra Smartwatch, the next-generation fitness and lifestyle companion built for performance, precision, and all-day power. Featuring a stunning 1.53-inch AMOLED HD display, dual GPS, NFC, Bluetooth calling, AI voice assistant, and 100+ sports modes, this CE/FCC/RoHS certified smartwatch delivers the perfect blend of style, durability, and advanced health tracking. Whether you’re training outdoors, navigating your day, or managing calls hands-free, the S4 Ultra keeps you connected and in control.

5 Reasons You’ll Love the Xiaomi S4 Ultra Smartwatch

1. Ultra-Clear 1.53” AMOLED Display + Premium Build

Experience every detail in rich color with a 360×360 AMOLED touchscreen protected by sapphire crystal glass. The luxurious body crafted from precious metals and a stainless-steel band delivers premium durability, comfort, and style—perfect for both men and women.

2. Complete GPS & Outdoor Performance Toolkit

Explore confidently with GPS motion trajectory, compass, altimeter, air pressure sensors, and IP68 swimming-grade waterproofing. From hiking and running to water sports, the S4 Ultra adapts to every outdoor challenge while providing accurate real-time location and environmental data.

3. Advanced Health & Fitness Ecosystem (24/7 Monitoring)

Track your day and night with a full suite of sensors measuring:
 Heart Rate
 Blood Oxygen (SpO2)
 Blood Pressure
 Sleep Quality
 Body Temperature
 Stress Levels
 Calorie & Activity Tracking
Combined with 100+ sports modes, workout monitoring, and intelligent insights via the RDFit app, you get a complete picture of your health.

4. NFC, Bluetooth Calling & AI Voice Assistant

Stay connected anytime—answer calls directly on your wrist, control music, receive messages, check notifications, and open intelligent NFC doors. With the built-in AI voice assistant and Bluetooth 5.3 (low-energy), the watch delivers fast, stable, power-efficient performance.

5. Long Battery Life + Fast Magnetic Charging

Powered by a 300mAh polymer battery, the S4 Ultra lasts:
7–10 days of daily use
Up to 90 days standby
Recharge from 0–100% in just 2 hours via magnetic USB charging. Engineered for efficiency, reliability, and nonstop performance.

Who This Smartwatch Is Made For + How to Use It

The Xiaomi S4 Ultra Smartwatch is ideal for adults who want a powerful, fashionable, and multifunctional smartwatch for fitness, daily productivity, outdoor adventure, or stylish everyday wear. It pairs seamlessly with Android, iOS, HarmonyOS, and all major smartphone systems, making setup easy through the RDFit App.

Use it daily for workout tracking, outdoor sports navigation, managing calls, monitoring health stats, controlling music, or enjoying hands-free AI assistance. With CE, FCC, RoHS, and CEC certifications, the S4 Ultra guarantees quality, safety, and long-lasting reliability—whether you’re gifting it or wearing it yourself.