| key specs |
| Display Size | 49mm | 36mm |
| Dial Shape | Rectangle | Round |
| Display Type | OLED Retina | AMOLED |
| Ideal For | Unisex | Unisex |
| Strap Colour | - | Black Viton, Brown Leather, Blue Leather |
| general |
| Brand | Apple | Xiaomi |
| Model | Watch Ultra | Watch S1 |
| Release date | September 7, 2022 | December 28, 2021 |
| Model Name | Watch Ultra | - |
| Dial Shape | Rectangle | Round |
| Size | Large | Regular |
| Touchscreen | Yes | Yes |
| Water Resistant | Yes | Yes |
| Water Resistance Depth | 40m | 5ATM |
| Usage | Fitness & Outdoor | - |
| Ideal For | Unisex | Unisex |
| Model Number | - | M2108W1 |
| Dial Colour | - | Silver |
| Strap Colour | - | Black Viton, Brown Leather, Blue Leather |
| Interchangeable Strap | - | Yes |
| Dial Material | - | Stainless steel |
| product details |
| Sensor | Compass, Always-On Altimeter, third-gen optical heart rate sensor, Accelerometer, Gyroscope, and Ambient light sensor | Heart rate sensor, SpO2 sensor, acceleration sensor, gyroscope, geomagnetic sensor, air pressure sensor, ambient light sensor |
| Notification | Yes | Yes |
| Battery Type | Lithium Ion | Li-ion polymer |
| Rechargeable Battery | Yes | - |
| Compatible Device | - | Android, iPhone |
| Battery Life | - | 12 days |
| connectivity features |
| Call Function | Yes | Yes |
| Bluetooth | Yes | Bluetooth |
| Wi-Fi | Yes | Yes |
| GPS | Yes | Yes |
| Call Features | International Emergency Calling | Yes |
| Other Connectivity Features | Emergency SOS | - |
| Bluetooth Version | - | v5.2 |
| Messaging Support | - | Yes |
| platform and storage features |
| Operating System | watchOS 9 | - |
| camera and display features |
| Display Size | 49mm | 36mm |
| Display Type | OLED Retina | AMOLED |
| Backlight Display | Yes | Yes |
| Other Display Features | LTPO OLED Always-On Retina display | - |
| Display Resolution | - | 466x466 |
| fitness and watch functions |
| Step Count | Yes | Yes |
| Calorie Count | Yes | Yes |
| Heart Rate Monitor | Yes | Yes |
| Altimeter | Yes | - |
| Compass | Yes | - |
| Calendar | Yes | Yes |
| Alarm Clock | Yes | Yes |
| Date & Time Display | Yes | Yes |
| Language | English | Simplified Chinese |
| Other Fitness Features | Blood Oxgen Sensor, ECG sensor | 117 sports modes |
| Chronograph | - | Yes |
| Number of Buttons | - | 2 |
| audio and video features |
| Speaker | Yes | Yes |
| Microphone | Yes | Yes |
| dimensions |
| Width | - | 46.5 |
| Height | - | 46.5 |
| Thickness | - | 11 |