Xiaomi Watch S4 (Black, 1.43" AMOLED)

How accurate is the health monitoring on the Xiaomi Watch S4?

The health monitoring features use advanced sensors to provide reliable readings for heart rate, blood oxygen levels and sleep tracking. The 24/7 continuous monitoring system has been praised by users for its accuracy compared to other fitness devices. However, like all consumer wearables, it should not replace professional medical equipment for clinical diagnosis or treatment decisions.

Can I swim with the Xiaomi Watch S4?

Yes, the watch has 5ATM water resistance rating, making it suitable for swimming in pools and open water up to 50 metres depth. The water resistance also covers showering, rain exposure and water sports activities. The aluminium alloy frame and robust construction ensure the watch maintains its waterproof seal during regular use.

How long does the battery actually last with regular use?

The 486mAh battery typically provides 10-12 days of use with standard settings including health monitoring, notifications and occasional GPS use. Heavy users with constant health checking, frequent GPS tracking and regular Bluetooth calling may see 7-10 days. The magnetic charging dock fully charges the watch in approximately 2 hours.

Does the watch work with both Android and iOS phones?

Yes, the Xiaomi Watch S4 is compatible with both Android and iOS devices through Bluetooth connectivity. You'll need to download the Xiaomi Wear app to sync data and customise settings. All core features including health tracking, notifications, calling and GPS work across both platforms, though some advanced features may vary between operating systems.

Can I change the watch straps and bezels?

The watch features the Quick-to-change bezel 2.0 system that automatically recognises new bezels and adjusts the display accordingly. Standard 22mm watch straps can be easily swapped and the watch is compatible with Xiaomi Watch S3 accessories. The system automatically detects new accessories and updates the interface to match your chosen style.

What sports modes are included and how do they work?

The watch includes over 150 sports modes covering running, cycling, swimming, yoga, skiing and many others. Smart automatic workout detection recognises when you start exercising and begins tracking without manual input. Each mode provides specific metrics relevant to that activity, with detailed post-workout analysis including route mapping when GPS is used.

How clear are phone calls made through the watch?

Bluetooth calling quality is surprisingly clear according to user reviews, with good audio quality for both incoming and outgoing calls. The built-in microphone and speaker provide hands-free convenience during workouts or when your phone isn't accessible. Call quality depends on your phone's Bluetooth connection strength and environmental noise levels.

What's included in the box with the Xiaomi Watch S4?

The package includes the Xiaomi Watch S4 with pre-installed bezel and silicone strap, a magnetic charging dock with cable and a comprehensive user manual with warranty information. The watch comes ready to use out of the box, requiring only the Xiaomi Wear app installation and Bluetooth pairing with your smartphone to access all features.