| key specs |
| Display Size | 36mm | - |
| Compatible OS | Android 8.0 or above, iOS 12.0 or above | Android, iOS |
| Dial Shape | Round | Rectangle |
| Display Type | AMOLED | - |
| Ideal For | Unisex | - |
| Strap Colour | - | Black, Green, Pink |
| Strap Material | - | Silicone |
| general |
| Brand | Xiaomi | Amazfit |
| Model | Watch S4 15th Anniversary Edition | Bip U |
| Release date | May 23, 2025 | October 15, 2020 |
| Model Name | Xiaomi Watch S4 15th Anniversary Edition | Bip U |
| Dial Colour | Black | Black, Green, Pink |
| Dial Shape | Round | Rectangle |
| Size | Regular | Regular |
| Touchscreen | 1.43 | Yes |
| Interchangeable Strap | Yes | Yes |
| Water Resistant | 5 ATM | 5 ATM |
| Usage | Regular | - |
| Ideal For | Unisex | - |
| Strap Material | - | Silicone |
| Water Resistance Depth | - | 50 metres |
| Dial Material | - | Polycarbonate |
| Strap Colour | - | Black, Green, Pink |
| dimensions |
| Width | 47.3 | 35.5 |
| Height | 47.3 | 40.9 |
| Thickness | 12 | 11.4 |
| Weight (g) | 44.50 | 31.00 |
| product details |
| Sensor | Heart Rate Monitor, Stress, Sleep | BioTracker 2 PPG Biological optical sensor, 6-axis acceleration sensor |
| Compatible Device | Android and iOS | Android, iOS |
| Battery Type | 486mAh | - |
| Notification | - | Yes |
| Battery Life | - | 9 days |
| Charge Time | - | 2 hours |
| Charger Type | - | 2 Pogo Pin Charger |
| connectivity features |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.0 |
| Wi-Fi | Yes | Yes |
| GPS | Yes | - |
| Other Connectivity Features | NFC, Galileo, Glonass, Beidou, QZSS | - |
| platform and storage features |
| Operating System | HyperOS 2 | RTOS |
| Compatible Operating System | Android 8.0 or above, iOS 12.0 or above | Android, iOS |
| camera and display features |
| Display Resolution | 466 x 466 | 320x302 |
| Display Size | 36mm | - |
| Display Type | AMOLED | - |
| Other Display Features | - | Anti-Fingerprint Coating, 2.5D Corning Gorilla Glass 3 |
| fitness and watch functions |
| Step Count | Yes | Yes |
| Calorie Count | Yes | Yes |
| Heart Rate Monitor | Yes | Yes |
| Alarm Clock | Yes | Yes |
| Date & Time Display | Yes | Yes |
| Language | English | English |
| Compass | - | Yes |
| Calendar | - | Yes |
| Number of Buttons | - | 1 |
| Other Fitness Features | - | 60 sports modes |
| Other Watch Functions | - | 24 hour heart rate monitoring, sleep quality monitoring, blood oxygen level sensor, menstrual cycle tracker |
| audio and video features |
| Speaker | - | Yes |
| Microphone | - | Yes |
| Other Multimedia Features | - | show notifications, control music, set alarms, remote control the phone’s camera |