Xiaomi Watch S4 15th Anniversary Edition vs Xiaomi Watch S2 comparison
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| key specs |
| Display Size | 36mm | 42mm |
| Compatible OS | Android 8.0 or above, iOS 12.0 or above | Android, iOS |
| Dial Shape | Round | Round |
| Display Type | AMOLED | AMOLED |
| Ideal For | Unisex | Unisex |
| Strap Colour | - | Black, Light Gold and Silver |
| Strap Material | - | Leather |
| general |
| Brand | Xiaomi | Xiaomi |
| Model | Watch S4 15th Anniversary Edition | Watch S2 |
| Release date | May 23, 2025 | January 10, 2022 |
| Model Name | Xiaomi Watch S4 15th Anniversary Edition | Xiaomi Watch S2 |
| Dial Colour | Black | Black |
| Dial Shape | Round | Round |
| Size | Regular | Large |
| Touchscreen | 1.43 | Yes |
| Interchangeable Strap | Yes | Yes |
| Water Resistant | 5 ATM | Yes |
| Usage | Regular | Fitness & Outdoor |
| Ideal For | Unisex | Unisex |
| Strap Colour | - | Black, Light Gold and Silver |
| Strap Material | - | Leather |
| Water Resistance Depth | - | 5ATM |
| dimensions |
| Width | 47.3 | - |
| Height | 47.3 | - |
| Thickness | 12 | - |
| Weight (g) | 44.50 | - |
| product details |
| Sensor | Heart Rate Monitor, Stress, Sleep | Blood Oxygen Monitor, Heart Rate Monitor |
| Compatible Device | Android and iOS | Android, iOS |
| Battery Type | 486mAh | 305 |
| Closure | - | Strap Buckle |
| Notification | - | Message |
| Battery Life | - | 12 Days |
| Rechargeable Battery | - | Yes |
| connectivity features |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.2 |
| Wi-Fi | Yes | - |
| GPS | Yes | Yes |
| Other Connectivity Features | NFC, Galileo, Glonass, Beidou, QZSS | Notifications |
| Call Function | - | Yes |
| Third Party App Support | - | Yes |
| Call Features | - | call, answer, reject and mute calls |
| platform and storage features |
| Operating System | HyperOS 2 | MIUI Watch OS |
| Compatible Operating System | Android 8.0 or above, iOS 12.0 or above | Android, iOS |
| camera and display features |
| Display Resolution | 466 x 466 | 466X466 |
| Display Size | 36mm | 42mm |
| Display Type | AMOLED | AMOLED |
| Other Display Features | - | Touch Screen |
| fitness and watch functions |
| Step Count | Yes | Yes |
| Calorie Count | Yes | - |
| Heart Rate Monitor | Yes | Yes |
| Alarm Clock | Yes | Yes |
| Date & Time Display | Yes | Yes |
| Language | English | - |
| Compass | - | Yes |
| Calendar | - | Yes |
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