Xiaomi Watch S4 (Stainless Steel Frame, Silicone Strap)

How long does the battery actually last with regular use?

The battery typically lasts 12-15 days depending on usage patterns. With continuous health monitoring enabled (heart rate, SpO2, stress checking every minute), users report getting around 12 days. With moderate use including notifications, occasional GPS tracking and standard health monitoring, you can expect closer to 15 days between charges.

Can I swim and shower with this watch?

Yes, the 5ATM water resistance rating means you can safely swim, shower and use it in water up to 50 metres depth. The watch includes specific swimming modes that track your pool sessions, stroke count and swimming efficiency. However, avoid pressing buttons underwater and rinse with fresh water after swimming in chlorinated or salt water.

Does the watch work with both Android and iPhone?

The watch is compatible with both Android and iOS devices through the Xiaomi Wear app. You'll get full functionality including health data sync, notifications, call handling and app management. Some advanced features may work better with Android devices, but core functions like fitness tracking, heart rate monitoring and notifications work seamlessly with iPhones.

How accurate is the heart rate and health monitoring?

The optical heart rate sensor provides clinically accurate readings during rest and moderate exercise. SpO2 monitoring gives reliable blood oxygen saturation measurements, whilst sleep tracking accurately identifies different sleep stages. For the most precise readings, ensure the watch sits snugly on your wrist about 1-2 finger widths above your wrist bone.

Can I download additional apps like Spotify or WhatsApp?

The watch runs on Xiaomi HyperOS 2.0 and doesn't support third-party app downloads like Spotify or WhatsApp. However, you can control music playback on your phone, receive message notifications from all apps and access built-in features like weather, calendar, breathing exercises and the comprehensive fitness tracking suite.

What sports and activities can the watch track automatically?

The watch automatically detects common activities like walking, running, cycling and swimming without manual activation. It supports over 150 sports modes including yoga, tennis, football, skiing, rowing and strength training. Each mode provides specific metrics relevant to that activity, such as stroke count for swimming or elevation gain for hiking.

How clear are phone calls made through the watch?

Call quality is surprisingly clear thanks to the built-in speaker and microphone system. Both you and the caller can hear conversations clearly in quiet to moderate noise environments. The feature works best for short conversations and proves particularly useful when your hands are occupied or your phone isn't immediately accessible.

What's included in the box and are replacement straps available?

The box includes the watch with attached silicone strap, magnetic charging dock and user manual with warranty information. Replacement straps are readily available, including metal options that the watch automatically recognises and adjusts the interface accordingly. The watch is also compatible with some Watch S3 accessories, providing good upgrade flexibility.