Xiaomi has announced the Watch S4 eSIM 15th Anniversary Edition at its 15th Anniversary Launch event. The smartwatch is powered by Xiaomi’s self-developed Xring T1 chip and is priced at 1299 yuan (~$180). It is available in China starting today in Black and Green Flame color options.
Xiaomi Watch S4 15th Anniversary Edition Specifications
The Xring T1 chip marks a significant shift for Xiaomi’s wearable strategy. It integrates a 4G modem and video codec module and runs at a maximum CPU frequency of 500MHz. Xiaomi claims the chip improves app launch times by 13% and reduces standby power consumption by 66%. It also lowers VoLTE and data power usage by 46% and 27% respectively.
The Watch S4 features a 1.43-inch AMOLED display with a resolution of 466 × 466 pixels, a 60Hz refresh rate, and a peak brightness of 2200 nits. Xiaomi uses Dragon Crystal Glass for screen protection. The watch weighs 44.5 grams and has a forged carbon bezel with “XRING INSIDE” engraved. The casing is made of PVD-treated aluminum alloy, paired with a stainless steel frame. Strap options include fluoro rubber and a woven nylon band.
Xiaomi includes 64MB RAM and 4GB of internal storage. The smartwatch supports over 150 sports modes, automatic workout detection, AI-guided running, and Pro Ski Mode 2.0. Health features cover heart rate monitoring, SpO₂ tracking, stress levels, sleep analysis, and women’s health tracking. The watch also supports cuff-less blood pressure estimation through the Xiaomi Health Research app.
Connectivity features include eSIM for 4G calling and messaging, Bluetooth 5.3, NFC for payments and smart access, dual-band GPS (L1+L5), and support for five satellite systems: GPS, GLONASS, Galileo, QZSS, and BeiDou. Xiaomi has added support for both Bluetooth and network-based outdoor walkie-talkie functionality.
It comes with a 486mAh battery that supports up to 9 days of usage with typical eSIM use and up to 15 days in Bluetooth-only mode. The watch supports magnetic 2-pin fast charging. It runs on Xiaomi HyperOS 2 and supports Android 8.0 and iOS 12.0 or above. However, some features like voice assistant and WeChat replies are limited to Android.
Xiaomi has also included smart car control for SU7 series vehicles via the Xiaomi Auto App, alongside gesture controls and Mi Home integration. The Watch S4 15th Anniversary Edition is IP-rated at 5ATM, making it suitable for swimming and other shallow water activities.
At the event, Xiaomi also introduced the 15S Pro with the new Xring O1 3nm chipset, a 6.73-inch 2K OLED display, Leica cameras, and a 6100mAh battery. The Xiaomi Civi 5 Pro also made its debut, powered by the Snapdragon 8s Gen 3 and featuring Leica-branded cameras.
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