The Xiaomi Watch S4 Black is the darkest and most understated of the three standard finishes Xiaomi offers for the Watch S4. A black bezel with minute markers and a black fluororubber strap frame the 1.43-inch AMOLED display, so the bright watch face stands out while the case recedes. Under the colour it is the same watch as the Silver and Rainbow versions: a 486 mAh battery rated for up to 15 days in Xiaomi’s typical-use test, Bluetooth calling, an independent dual-frequency GNSS chip and 5ATM water resistance, running Xiaomi HyperOS 2.
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How the Xiaomi Watch S4 Black looks and wears
Black turns the Xiaomi Watch S4 into a classic sports watch rather than a gadget. The bezel markings and the crown give it a traditional outline, and with the screen off the round face nearly disappears into the case. It suits gym kit, a work shirt or a thobe cuff equally well, and sweat marks and dust on the black fluororubber strap are far less obvious than on lighter colours, which makes it the easiest finish to keep looking clean on daily wear. The strap adjusts from about 140 to 210 mm. Fine scratches on a dark bezel can show in direct light, so a quick wipe keeps it looking new.
Who the black finish suits, and changing it later
The Xiaomi Watch S4 Black suits buyers who wear one watch for everything: training in the morning, the office and an evening out. It is also the safest pick as a gift when you do not know the person’s taste. The look is not fixed for ever: the Watch S4 is built around interchangeable bezels, and Xiaomi sells separate bezel and strap kits, so you can add a lighter or more formal look later. Xiaomi notes that the detachable structure leaves a small gap between bezel and body, so rinse away sweat and dirt there after hard sessions. The 1.43-inch AMOLED runs at 466 × 466 pixels with up to 1500 nits HBM across the full screen.
Battery life and what 15 days assumes
Xiaomi rates the Xiaomi Watch S4 Black at up to 15 days of typical use, measured in its own labs. The test watch had high-precision sleep, sleep breathing quality, all-day stress and all-day blood oxygen monitoring switched off, checked heart rate every 10 minutes, and handled 100 messages, 2 calls and 3 alarms a day, 200 wrist-raise screen wakes a day, 15 minutes of Bluetooth calls and 90 minutes of exercise a week. Turn on the all-day health features or use GNSS often and the figure drops; Xiaomi does not publish a heavy-use or always-on number. For the Xiaomi Watch S4 Black, five minutes on the 2-pin magnetic dock adds about two days of use, according to Xiaomi.
Calls, notifications and NFC
On the Xiaomi Watch S4 Black, a speaker and two microphones let you take ordinary phone calls on the wrist while the watch stays connected to your phone over Bluetooth 5.3. There is no eSIM, and Xiaomi states that voice calls from third-party apps are not currently supported, so WhatsApp calls still ring on the phone. NFC is supported for contactless payment with Mastercard and Visa, but Xiaomi notes that availability varies by region and bank. Some features need the Mi Fitness app running in the background, and the Xiaomi Smart Hub controls for Xiaomi Home devices need a Xiaomi phone or tablet on HyperOS 2.
Health tracking and 150+ sports modes
A one-tap check measures heart rate, stress, blood oxygen and sleep and gives a short report in about 60 seconds. Xiaomi claims heart-rate accuracy of up to 98% in its lab tests covering sitting, office reading, treadmill and outdoor running, walking and cycling, and states clearly that the watch is not a medical device. For training, the Xiaomi Watch S4 Black offers more than 150 sports modes and has an independent L1+L5 dual-frequency GNSS chip using GPS, Galileo, GLONASS, BeiDou and QZSS, so outdoor runs and rides are tracked without the phone. Sensors include an accelerometer, gyroscope, compass, barometer and ambient light sensor, and the 5ATM rating covers pool and shallow-water swimming.
Who This Is Not For
The Xiaomi Watch S4 Black is not for anyone who wants to leave the phone at home: it has no eSIM, and calls only work with the phone connected. It cannot answer WhatsApp or other app voice calls. The 5ATM rating does not cover hot showers, saunas or diving. iPhone users lose the Xiaomi Smart Hub features, and the dark bezel can show fine scratches in direct light. It is a fitness tool, not a medical device.
Ordering from Totot
Totot sells the Xiaomi Watch S4 Black brand-new and genuine in its sealed box, backed by a 1-year warranty from Totot. It reaches any emirate within 3 business days at most, with free delivery on orders from AED 300, with cash on delivery or instalments via Tabby and Tamara. Items that arrive defective or not as ordered can be returned within 14 days, and any shipping damage should be reported within 48 hours of delivery. Browse more in our Smart Watches range, or see the official Xiaomi Watch S4 specifications page.
Xiaomi Watch S4 Black Specifications
- Model: Xiaomi Watch S4 (47.3 mm case, 1.43-inch display)
- Colour: Black (standard Black bezel and fluororubber strap)
- Display: 1.43-inch AMOLED, 466 × 466 px, about 326 PPI, 60Hz (varies by interface)
- Brightness: Up to 1500 nits HBM (full screen); up to 2200 nits peak (small area)
- Case: Aluminium alloy with high-gloss PVD finish
- Dimensions: 47.3 × 47.3 × 12.0 mm (excluding strap and protrusions)
- Weight: About 44.5 g without strap
- Strap: Fluororubber, adjustable about 140–210 mm
- Battery: 486 mAh; up to 15 days typical use (Xiaomi lab test); 5 min charge ≈ 2 days
- Charging: 2-pin magnetic charging dock
- Sensors: Heart rate (with SpO2), accelerometer, gyroscope, ambient light, electronic compass, barometer, Hall sensor
- Positioning: Dual-frequency L1+L5 GNSS: GPS, Galileo, GLONASS, BeiDou, QZSS
- Sports modes: 150+
- Calling: Bluetooth calls, speaker + 2 microphones; phone must stay connected; no third-party app voice calls
- NFC: Supported (Mastercard, Visa; availability varies by region and bank)
- Water resistance: 5ATM (pool and shallow water; not hot water, sauna or diving)
- Connectivity: Bluetooth 5.3
- Operating system: Xiaomi HyperOS 2
- Compatibility: Android 8.0+ or iOS 14.0+
- In the box: Watch (with bezel and strap), magnetic charging dock, user manual
- Warranty: 1-year warranty from Totot
Xiaomi Watch S4 Black FAQ
Does the black strap show sweat and dirt?
No, much less than the Silver or Rainbow straps; a rinse after training is still recommended.
Can I change the black bezel later?
Yes. The Watch S4 uses interchangeable bezels, and Xiaomi sells other bezel and strap kits separately.
Does the Xiaomi Watch S4 Black have an eSIM?
No. It connects to your phone over Bluetooth 5.3, and calls only work while the phone is connected.
Can I answer WhatsApp calls on it?
No. Xiaomi says voice calls from third-party apps are not currently supported.
Can I swim with the Xiaomi Watch S4 Black?
Yes, in a pool or shallow water thanks to 5ATM, but not in hot water, saunas or while diving.
Does it work with an iPhone?
Yes, with iOS 14.0 or later, though Xiaomi Smart Hub features need a Xiaomi phone or tablet on HyperOS 2.
Is it genuine?
Yes. We sell the genuine Xiaomi Watch S4 Black, brand-new in its sealed box.
How long does delivery take?
3 business days at most across the UAE. Orders from AED 300 ship free, and the checkout page shows any current fee for your order.
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