Amazfit Helio Strap vs Xiaomi Watch S4
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At a glance
Key specifications and important differences. Full details follow below.
| Feature |  Amazfit Helio Strap |  Xiaomi Watch S4 |
|---|---|---|
| Price | KSh 22,000.00 | KSh 20,000.00 |
| Display | — | 1.43-inch AMOLED, 60 Hz |
| Battery capacity | 232 mAh rated | 486 mAh |
| Water resistance | 5 ATM; suitable for splashes, showering and shallow-water swimming, not diving or high-pressure water activities | 5 ATM rated for suitable shallow-water activities |
| Operating system | — | Xiaomi HyperOS 2 |
| Positioning / GNSS | — | Built-in GPS, Galileo, GLONASS, BeiDou and QZSS |
| Health & wellness features | 24-hour heart rate, blood oxygen, stress, BioCharge energy level, PAI and heart-rate recovery; wellness measurements are not intended for medical diagnosis | Heart rate, blood oxygen, stress, breathing and activity tracking; wellness data is not intended for medical diagnosis |
Full specifications
2 of 4 products
| Specification | Amazfit Helio Strap | Xiaomi Watch S4 |
|---|---|---|
| Identity & design | ||
| Brand | Amazfit | Xiaomi |
| Model | Helio Strap (A2445) | Xiaomi Watch S4 |
| Announced | — | March 2025 (global model) |
| Dimensions | 33.97 × 24.3 × 10.59 mm (heart-rate sensor base excluded) | 47.3 × 47.3 × 12.0 mm (strap and protrusions excluded) |
| Weight | 20 g | Approximately 44.5 g (strap excluded) |
| Build materials | Fiber-reinforced polymer sensor body | Aluminum-alloy frame with interchangeable bezel |
| Wrist size | 145–205 mm | Black/Silver: approximately 140–210 mm; Rainbow: approximately 135–210 mm |
| Strap / band | 22 mm nylon strap with hook-and-loop fastening | Fluororubber; Rainbow configuration also includes nylon strap |
| Controls / buttons | Screen-free smart band with indicator lights; controls and data are managed through the Zepp app | Rotating crown, side control, interchangeable bezel interaction, and touchscreen |
| Display | ||
| Display | — | 1.43-inch AMOLED, 60 Hz |
| Screen resolution | — | 466 × 466 pixels (~326 ppi) |
| Display features | — | Always-on display; up to 1,500 nits HBM |
| Performance & software | ||
| Operating system | — | Xiaomi HyperOS 2 |
| Connectivity | ||
| Bluetooth | Bluetooth 5.2 BLE | Bluetooth 5.3 |
| NFC | — | Supported; availability varies by region |
| Positioning / GNSS | — | Built-in GPS, Galileo, GLONASS, BeiDou and QZSS |
| Audio & communication | ||
| Speaker | — | Built-in speaker |
| Microphone | — | Two built-in microphones |
| Calling | — | Bluetooth calling when paired with a compatible phone; third-party app voice calls not supported |
| Sensors, health & fitness | ||
| Sensors | BioTracker 6.0 PPG biometric sensor (5PD + 2LED), accelerometer, gyroscope and temperature sensor | Heart-rate/blood-oxygen sensor, accelerometer, gyroscope, ambient-light sensor, electronic compass, barometer and Hall sensor |
| Health & wellness features | 24-hour heart rate, blood oxygen, stress, BioCharge energy level, PAI and heart-rate recovery; wellness measurements are not intended for medical diagnosis | Heart rate, blood oxygen, stress, breathing and activity tracking; wellness data is not intended for medical diagnosis |
| Sleep tracking | Sleep stages including REM, naps, sleep schedule, sleep HRV, breathing quality and sleep score | Sleep monitoring supported |
| Sports / workout modes | 50+ sports modes, including smart strength training and official HYROX Race mode | More than 150 sports modes |
| Battery & durability | ||
| Battery capacity | 232 mAh rated | 486 mAh |
| Battery life | Up to 10 days typical use | Up to 15 days typical use; actual life varies by settings and use |
| Charging | Magnetic charging head; less than 2 hours; USB-C cable is not included | 2-pin magnetic charging dock |
| Water resistance | 5 ATM; suitable for splashes, showering and shallow-water swimming, not diving or high-pressure water activities | 5 ATM rated for suitable shallow-water activities |
| Compatibility | ||
| Phone compatibility | Android 7.0 or later; iOS 15.0 or later | Android 8.0 or later; iOS 14.0 or later |
| Companion app | Zepp app; supports synchronization with Strava, TrainingPeaks, adidas Running, komoot, Relive, Google Fit and Apple Health where available | Mi Fitness |
| Colors | Black | Black, Silver, or Rainbow depending on configuration |
| Additional specifications | ||
| Vibration motor | Rotor motor | — |
| Charging time | Less than 2 hours from empty | — |
| Smart recognition | Recognizes 25 strength-training movements | — |
| Offline data storage | Stores up to 21 days of offline heart-rate data | — |
| Real-time heart-rate broadcast | Supported; heart rate can be synchronized to compatible third-party smartwatches | — |
| Workout status | PeakBeats training-status system | — |
| Energy, load and readiness features | BioCharge energy-level tracking | — |
| Other health features | PAI health assessment and heart-rate recovery | — |
| Third-party fitness apps | Strava, TrainingPeaks, adidas Running, Runna, komoot, Relive, Google Fit and Apple Health; availability varies by region and platform | — |
| Packing list | Smart band and strap assembled, magnetic charging head without cable, and instruction manual | — |
| Packaging materials | Made with 100% recyclable materials | — |
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