| key specs |
| Display Size | 49mm | - |
| Dial Shape | Rectangle | Round |
| Display Type | OLED Retina | - |
| Ideal For | Unisex | - |
| Strap Material | - | Silicone |
| general |
| Brand | Apple | Huami |
| Model | Watch Ultra | Amazfit Stratos 3 |
| Release date | September 7, 2022 | August 27, 2019 |
| Model Name | Watch Ultra | Stratos 3 |
| Dial Shape | Rectangle | Round |
| Size | Large | - |
| Touchscreen | Yes | Yes |
| Water Resistant | Yes | 5ATM |
| Water Resistance Depth | 40m | 50 Meters |
| Usage | Fitness & Outdoor | For Sports |
| Ideal For | Unisex | - |
| Strap Material | - | Silicone |
| Dial Material | - | Stainless Steel |
| product details |
| Sensor | Compass, Always-On Altimeter, third-gen optical heart rate sensor, Accelerometer, Gyroscope, and Ambient light sensor | BioTracker PPG Bio-Tracking optical sensor, 6-axis acceleration sensor, 3-axis geomagnetic sensor, Air pressure sensor |
| Notification | Yes | Yes |
| Battery Type | Lithium Ion | Lithium-ion polymer battery |
| Rechargeable Battery | Yes | - |
| Compatible Device | - | Android 5.0 or iOS 10.0 and above |
| Notification Type | - | Calls, Messages, App Alerts |
| Battery Life | - | 7 days in smart mode |
| Charge Time | - | 2.5 hours |
| connectivity features |
| Call Function | Yes | - |
| Bluetooth | Yes | Yes |
| Wi-Fi | Yes | Yes |
| GPS | Yes | Yes |
| Call Features | International Emergency Calling | - |
| Other Connectivity Features | Emergency SOS | - |
| Bluetooth Version | - | 5.0 |
| platform and storage features |
| Operating System | watchOS 9 | Amazfit OS |
| Number of Cores | - | dual-core |
| RAM | - | 512MB |
| Processor Speed | - | 1200 |
| Internal Memory | - | 2GB |
| camera and display features |
| Display Size | 49mm | - |
| Display Type | OLED Retina | - |
| Backlight Display | Yes | - |
| Other Display Features | LTPO OLED Always-On Retina display | - |
| Display Resolution | - | 320x320 |
| fitness and watch functions |
| Step Count | Yes | Yes |
| Calorie Count | Yes | Yes |
| Heart Rate Monitor | Yes | Yes |
| Altimeter | Yes | - |
| Compass | Yes | - |
| Calendar | Yes | - |
| Alarm Clock | Yes | Yes |
| Date & Time Display | Yes | - |
| Language | English | - |
| Other Fitness Features | Blood Oxgen Sensor, ECG sensor | 80 Sports Modes |
| Number of Buttons | - | 4 |
| audio and video features |
| Speaker | Yes | - |
| Microphone | Yes | - |
| Audio Features | - | Standalone Music Playback |
| dimensions |
| Thickness | - | 13.4 mm |
| Diameter | - | 48.6mm |
| Weight (g) | - | 40.40 |