Description
The Xiaomi Watch S4 41mm brings the Watch S4 design to a smaller case for slimmer wrists. Announced in China in June 2025 and rolled out to global markets that September, it adds a redesigned heart rate module, skin temperature tracking and dual-band GNSS to a 41 mm stainless steel body that is only 9.5 mm thick. It runs Xiaomi HyperOS 2 rather than Wear OS, which keeps the software light and the battery going for days.
Xiaomi Watch S4 41mm key specs
| Display | 1.32-inch AMOLED, 466 x 466 pixels, up to 2,200 nits peak |
|---|---|
| Case | 41.2 x 41.2 x 9.5 mm, stainless steel frame and bezel |
| Weight | About 32 g |
| Water resistance | 5 ATM |
| Positioning | Dual-band GNSS: GPS, GLONASS, Galileo, BeiDou, QZSS |
| Sensors | Heart rate, SpO2, skin temperature, barometer, compass, gyroscope |
| Battery | 320 mAh, up to about 8 days with light use |
| Software | Xiaomi HyperOS 2, 150+ sports modes, SOS button |
Who the Xiaomi Watch S4 41mm is for
It is a good match for anyone who found 46 mm smartwatches too bulky and prefers something that reads as a dress watch. Runners and walkers benefit from the dual-band GPS, while the sleep and cycle tracking cover everyday health logging. Because it pairs through Xiaomi’s Mi Fitness app on both Android and iPhone, it also works for people who do not use a Xiaomi phone. Buyers who need a large app store or LTE should look at Wear OS or Apple models instead.
What to check before buying a new Xiaomi Watch S4 41mm on eBay
- Confirm the case size in the title and photos; the Watch S4 is also sold in a larger standard size that looks similar.
- NFC payments depend on region and are generally not usable in the USA or Canada, so do not buy it for tap-to-pay.
- Ask whether the unit is global or Chinese stock; a Chinese-market version may limit language and app options.
- Check the included strap type (fluororubber, leather or Milanese) since bundles vary between listings.
- A sealed box and a seller with a clear return window protect you if the watch will not pair.
Xiaomi Watch S4 41mm FAQ
Does the Xiaomi Watch S4 41mm work with an iPhone?
Yes. It connects to the Mi Fitness app on iOS as well as Android, although some features such as replying to messages are more limited on iPhone.
How long does the battery last?
Xiaomi rates the 320 mAh battery for up to about 8 days of light use. Always-on display and frequent GPS workouts shorten that.
Can I swim with it?
Yes, the 5 ATM rating covers pool and shallow open-water swimming. It is not meant for diving, saunas or hot showers.
How buying works
The button opens a page of new Xiaomi Watch S4 41mm listings on eBay so you can compare sellers side by side. You pay through eBay, then the chosen seller sends the watch to your address. Should it fail to arrive or turn out different from the description, eBay Money Back Guarantee protection applies. Read the item page for the final price, delivery charges and return policy before you buy.
