At Xiaomi’s 15th-anniversary strategic product launch, the Xiaomi Watch S4 eSIM 15th Anniversary Edition stood out as a milestone in the brand’s “Human-Car-Home” ecosystem. Designed with “exclusive customization from the inside out,” this smartwatch is the first to feature Xiaomi’s in-house Xuanjie T1 chip, marking a significant technological breakthrough.
The forged carbon bezel is a standout feature, with each unit showcasing a unique carbon fiber pattern. The XRING INSIDE engraving on the top-right corner highlights the self-developed chip while adding a premium touch. The bezel is also interchangeable, allowing users to personalize their watch with different styles in the future.
The watch’s durability is enhanced with Dragon Crystal Glass, the same material used in Xiaomi’s Pro series, offering 30% better impact resistance and superior scratch resistance compared to standard glass. The fluoroelastomer + woven hybrid strap ensures comfort and durability, making it suitable for both daily wear and outdoor activities.
Custom watch faces further elevate the experience, featuring racing-inspired designs, dynamic car silhouettes, and engine sound effects when the bezel is attached—a nod to Xiaomi’s automotive ecosystem.
Xuanjie T1 Chip: In-House Baseband + Video Decoding
The Xuanjie T1 chip is the heart of the Watch S4 Anniversary Edition, delivering significant improvements in performance and efficiency.
Battery Life: With eSIM enabled, battery life extends from 7 to 9 days, a 27% reduction in power consumption during communication. In real-world testing, the watch lasts 7.5 days with moderate use (including fitness tracking and calls) and 3 days under heavy usage.
Video Decoding: Users can create custom 3-second dynamic watch faces from smartphone videos and enjoy real-time previews when remotely controlling phone cameras—eliminating the “blind shooting” issue of traditional Bluetooth remotes.
4G-LTE Connectivity: Enhanced signal stability ensures clearer calls even in weak network conditions.
This chip represents Xiaomi’s shift from supply chain reliance to in-house innovation, laying the foundation for deeper ecosystem integration.
Human-Car-Home Ecosystem: Wrist-Based Car Control + Fitness Vlogging
As a key part of Xiaomi’s ecosystem strategy, the Watch S4 Anniversary Edition introduces two major features:
Wrist-Based Car Control: The built-in Xiaomi Car App supports 11 functions, including remote start, lock/unlock, and trunk control. When paired with Xiaomi’s SU7/YU7 models, users can check real-time vehicle status and perform quick preparations with a flick of the wrist.
Fitness Vlogging: The watch overlays heart rate, calories burned, and other metrics onto recorded videos, creating shareable workout clips—perfect for fitness enthusiasts.
Additionally, the watch integrates seamlessly with Mi Home, introducing a ”finger-snap” gesture control for smart home devices, further simplifying multi-device interactions.
Dual-Mode Walkie-Talkie + Advanced Health Tracking
The Watch S4 Anniversary Edition supports dual-mode walkie-talkie functionality:
Network-based (eSIM/cellular): Enables long-distance communication, ideal for group hikes or cycling trips.
Bluetooth-based: Works offline within 200 meters, suitable for camping or construction sites.
Health monitoring has also been upgraded, featuring:
- Medical-grade accuracy (98.2%) for heart rate and SpO₂ tracking.
- 150+ sports modes, sleep stage analysis, and stress monitoring.
- Weekly/Monthly reports via the Xiaomi Health App.
Conclusion
The Xiaomi Watch S4 eSIM 15th Anniversary Edition is more than a limited-edition redesign—it’s a showcase of Xiaomi’s technological advancements in wearables. With 9-day battery life, car control, dual-mode walkie-talkie, and deep ecosystem integration, it addresses core smartwatch pain points while serving as a new interaction hub for Xiaomi’s automotive and smart home ecosystems.
For tech enthusiasts and Xiaomi ecosystem users, this watch offers both practical utility and commemorative value.
