| key specs |
| Dial Shape | Round | Round |
| Display Type | AMOLED | AMOLED |
| Ideal For | Unisex | Unisex |
| Display Size | - | 36mm |
| Compatible OS | - | Android 8.0 or above, iOS 12.0 or above |
| general |
| Brand | Amazfit | Xiaomi |
| Model | Cheetah 2 Ultra | Watch S4 15th Anniversary Edition |
| Release date | June 9, 2026 | May 23, 2025 |
| Dial Shape | Round | Round |
| Size | Large | Regular |
| Touchscreen | 1.5 | 1.43 |
| Water Resistant | 5 ATM | 5 ATM |
| Water Resistance Depth | 50 m | - |
| Usage | Regular, Sports, Adventure Sports | Regular |
| Ideal For | Unisex | Unisex |
| Model Name | - | Xiaomi Watch S4 15th Anniversary Edition |
| Dial Colour | - | Black |
| Interchangeable Strap | - | Yes |
| dimensions |
| Width | 47.4 | 47.3 |
| Height | 47.4 | 47.3 |
| Thickness | 15.6 | 12 |
| Weight (g) | 52.00 | 44.50 |
| product details |
| Sensor | BioTracker PPG biometric sensor, Accelerometer, Gyroscope, Geomagnetic sensor, Temperature sensor, Barometric altimeter, Ambient light sensor | Heart Rate Monitor, Stress, Sleep |
| Battery Type | 780mAh | 486mAh |
| Battery Life | 30 days | - |
| Rechargeable Battery | Yes | - |
| Compatible Device | - | Android and iOS |
| connectivity features |
| Call Function | Yes | - |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.2 | 5.3 |
| GPS | Yes | Yes |
| Wi-Fi | - | Yes |
| Other Connectivity Features | - | NFC, Galileo, Glonass, Beidou, QZSS |
| platform and storage features |
| Operating System | ZeppOS 6 | HyperOS 2 |
| Internal Memory | 64GB | - |
| Compatible Operating System | - | Android 8.0 or above, iOS 12.0 or above |
| camera and display features |
| Display Resolution | 480 x 480 | 466 x 466 |
| Display Type | AMOLED | AMOLED |
| Other Display Features | Up to 3,000 nits, Sapphire glass | - |
| Display Size | - | 36mm |
| fitness and watch functions |
| Step Count | Yes | Yes |
| Heart Rate Monitor | Yes | Yes |
| Altimeter | Yes | - |
| Compass | Yes | - |
| Date & Time Display | Yes | Yes |
| Language | English | English |
| Number of Buttons | 4 | - |
| Calorie Count | - | Yes |
| Alarm Clock | - | Yes |
| audio and video features |
| Speaker | Yes | - |
| Microphone | Yes | - |