👍 Pros
- Comprehensive cellular connectivity (GSM, HSPA, LTE) for standalone use
- High-brightness AMOLED display with excellent peak luminosity (2200 nits)
- Robust build quality with aluminum frame, stainless steel bezel, and scratch/drop-proof glass
- Advanced dual-band positioning system (GPS L1+L5, GLONASS, GALILEO, BDS, QZSS)
- Includes NFC for contactless payments (market/region dependent)
👎 Cons
- Released in late 2024, its HyperOS 2 may face increasing competition from newer smartwatch OS versions by 2026
- Specific battery capacity is not provided, making direct comparisons difficult
- eSIM functionality is market/region dependent, potentially limiting full feature access for some users
- Waterproof rating (5ATM) is standard but not suitable for deep diving
Expert Review & Rating
Detailed Analysis
Design & Build
The Xiaomi Watch S4, released in late 2024, presents a robust and aesthetically pleasing design. Its 47.3 x 47.3 x 12 mm dimensions and 44.5 g weight position it as a standard-sized smartwatch. The construction features an aluminum frame complemented by a stainless steel bezel, offering a premium tactile experience and enhanced durability. The display is protected by a scratch/drop-proof glass, a crucial element for daily wear. Furthermore, its 5ATM waterproof rating ensures resilience against water exposure during activities like swimming, though it is not designed for diving.
Performance & Health Tracking
Operating on HyperOS 2, the Xiaomi Watch S4 offers a proprietary software experience. While HyperOS 2 was current at its 2024 launch, by 2026, its long-term update strategy and app ecosystem competitiveness against newer iterations of Wear OS or watchOS will be a critical factor for prospective buyers. The device’s comprehensive connectivity suite, including GSM, HSPA, and LTE, facilitates standalone cellular functionality, reducing reliance on a paired smartphone. Bluetooth 5.3 ensures efficient wireless accessory connection. For location tracking, the dual-band GPS (L1+L5) alongside GLONASS, GALILEO, BDS, and QZSS provides highly accurate positioning, beneficial for fitness tracking and navigation. NFC support, where available, enables convenient contactless payments. While specific health tracking sensors are not detailed in the provided data, a modern smartwatch of this caliber would typically include heart rate monitoring, blood oxygen saturation, and activity tracking.
Battery Life
The provided data does not specify the battery capacity of the Xiaomi Watch S4. This omission makes it challenging to provide a direct assessment of its expected battery life or to compare it against contemporary smartwatches in 2026. Users should consult regional product specifications or reviews for detailed battery performance metrics.
Verdict
The Xiaomi Watch S4, launched in late 2024, remains a capable smartwatch in 2026, particularly for users prioritizing robust build quality, a vibrant AMOLED display with high brightness, and extensive cellular connectivity. Its advanced positioning system is a notable advantage for outdoor activities. However, the unspecified battery capacity and the potential for its HyperOS 2 to feel less current compared to newer operating systems by 2026 are considerations. For users seeking a feature-rich smartwatch with strong standalone capabilities and a premium aesthetic, the Xiaomi Watch S4 could still be a viable option, provided its regional pricing is competitive against newer models. Those prioritizing the absolute latest software experience or requiring specific battery life assurances might need to evaluate alternatives.