A watch that tracks health data but cannot diagnose anything is only useful if you understand where that line sits. The Xiaomi Watch S4 Black monitors heart rate, blood oxygen, heart rate variability and skin temperature continuously, and Xiaomi states plainly that none of it is designed for medical purposes.
Table of Contents
- Xiaomi Watch S4 Black: What the Sensors Track
- Water Droplet Detection
- Two Microphones for Clearer Calls
- Who Black Suits
- The Magnetic Charging Dock
- Technical Specifications
- FAQ
Xiaomi Watch S4 Black: What the Sensors Track
Heart rate, SpO2, heart rate variability, skin temperature, sleep stages and stress levels are all tracked continuously, and the HyperOS companion app surfaces the data as fitness tips and battery management suggestions rather than raw numbers alone. Xiaomi is explicit that none of this is intended to predict, diagnose, prevent or treat any medical condition — it is for personal wellbeing reference.
For anyone managing an actual health condition, these readings should never replace a proper medical device or a conversation with a doctor.
Water Droplet Detection
A newer algorithm specifically prevents accidental screen taps caused by water droplets sitting on the touchscreen, which matters more than it sounds — sweat during a workout or rain on a walk can otherwise trigger unwanted inputs on a touch-based watch face.
Full specifications are on the official Xiaomi Watch S4 specifications page.
Browse more in our smart watches collection, or see everything we carry from Xiaomi.
Xiaomi Watch S4 Black: Two Microphones for Calls
The dual-microphone array is built specifically for Bluetooth calling from the wrist, working alongside the built-in speaker so calls stay clear without needing to reach for your phone. This is limited to standard phone calls; third-party app calling is not currently supported.
Who Black Suits
Black is the more discreet, all-purpose finish, working equally well in an office setting and at the gym without drawing attention either way. It hides scuffs and fingerprints on the aluminium case better than the lighter Silver option.
Both colours share identical sensors, battery and features — the choice comes down entirely to preference.
Xiaomi Watch S4 Black Charging Dock
Charging uses a 2-pin magnetic dock rather than a full cradle, which snaps into place quickly and holds securely enough to avoid accidental disconnection overnight. There is no wireless Qi charging on this model — the magnetic dock is the only charging method.
Technical Specifications
- Model: Xiaomi Watch S4
- Colour: Black
- Display: 1.43-inch AMOLED, 466 x 466 pixels, 326 PPI, 60Hz refresh rate
- Brightness: Up to 1500 nits HBM
- Case Material: Aluminium alloy
- Water Resistance: 5ATM, equivalent to a simulated depth of 50 m
- Battery Capacity: 486 mAh
- Battery Life: Up to 15 days typical usage mode
- Charging: 2-pin magnetic charging dock
- Sports Modes: 150+, with built-in GNSS positioning
- Health Sensors: Heart rate, SpO2, HRV, temperature, sleep and stress monitoring
- Calling: Bluetooth phone calls, built-in speaker and 2 microphones
- Connectivity: Bluetooth 5.3, NFC (availability varies by region)
- Compatibility: Android 8.0+ or iOS 14.0+
- OS: Xiaomi HyperOS 2
- Dimensions: Approximately 4.7 x 4.7 x 1.2 cm case
- Weight: Approximately 44 g
- Warranty: 1-year warranty from Totot
FAQ – Xiaomi Watch S4 Black
Are the health readings on the Xiaomi Watch S4 Black medically accurate?
No, Xiaomi states these features are not designed for medical diagnosis, prevention or treatment, and are for personal reference only.
Does it prevent accidental taps from sweat or rain?
Yes, a water droplet detection algorithm reduces accidental screen inputs from moisture.
Can I charge it wirelessly?
No, it uses a proprietary 2-pin magnetic charging dock rather than Qi wireless charging.
Is Black different in performance from Silver?
No, both share identical sensors, battery capacity and features. Only the case colour differs.
Does it support NFC payments?
NFC is included, though availability of payment services varies by region.
Does Totot deliver across the UAE?
Yes. We ship nationwide via Aramex for a fixed AED 10, with cash on delivery, Tabby and Tamara available at checkout.
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