| key specs |
| Strap Colour | Black Fluororubber, Brown Leather | Black, Dark Grey, Grey and Pink |
| Dial Shape | Round | Round |
| Display Type | AMOLED | AMOLED |
| Ideal For | Unisex | - |
| Display Size | - | 36mm |
| Compatible OS | - | Android, iOS |
| Strap Material | - | Silicone |
| general |
| Brand | Amazfit | Fire-Boltt |
| Model | GTR 4 New | Apollo 2 |
| Release date | September 4, 2024 | June 23, 2023 |
| Model Name | GTR 4 New | Fire-boltt Apollo 2 |
| Dial Shape | Round | Round |
| Strap Colour | Black Fluororubber, Brown Leather | Black, Dark Grey, Grey and Pink |
| Size | Regular | - |
| Touchscreen | 1.45 | - |
| Water Resistant | 5 ATM | IP67 |
| Usage | Regular | - |
| Dial Material | Stainless Steel | - |
| Ideal For | Unisex | - |
| Model Number | - | BSW147 |
| Dial Colour | - | Black |
| Strap Material | - | Silicone |
| dimensions |
| Width | 46.5 | 43.5 mm |
| Height | 46.5 | 10 mm |
| Thickness | 11.2 | 10 mm |
| Weight (g) | 49.00 | 100.00 |
| Diameter | - | 36.322 mm |
| product details |
| Sensor | heart rate, SpO2, steps, sleep tracker | SpO2 sensor, Heart Rate tracker, Sleep tracker, Female health tracker |
| Compatible Device | Android 7.0 and above, iOS 12.0 and above | Android, iOS |
| Battery Type | 475 | Lithium Ion |
| Battery Life | 12 days | - |
| Rechargeable Battery | Yes | Yes |
| Notification | - | Yes |
| Notification Type | - | Smart Notification |
| Charge Time | - | 2 hours |
| Charger Type | - | USB cable |
| Stand By Time | - | 20 days |
| connectivity features |
| Call Function | Yes | Yes |
| Bluetooth | Yes | Bluetooth |
| Bluetooth Version | 5.0 | Bluetooth 5.0 |
| Wi-Fi | Yes | - |
| GPS | Yes | - |
| platform and storage features |
| Operating System | ZeppOS 2.0 | - |
| Compatible Operating System | - | Android, iOS |
| camera and display features |
| Display Resolution | 466 x 466 | 466x466 pixels |
| Display Type | AMOLED | AMOLED |
| Display Size | - | 36mm |
| fitness and watch functions |
| Step Count | Yes | Yes |
| Heart Rate Monitor | Yes | Yes |
| Altimeter | Yes | - |
| Date & Time Display | Yes | Yes |
| Language | English | - |
| Number of Buttons | 2 | 2 |
| Other Fitness Features | Menstrual health tracker | Activity Tracker, Breathe, 110 Sports Mode Tracking, Calorie Tracker, Sedentary Reminder, Sleep Monitor |
| Calorie Count | - | Yes |
| Compass | - | Yes |
| Calendar | - | Yes |
| Alarm Clock | - | Yes |
| Other Watch Functions | - | Alarm Clock, Bluetooth Calling, Voice Assistance, In Built Mic & Speaker, IP67 Rating, Music Player, Notifications |
| audio and video features |
| Speaker | Yes | - |
| Microphone | Yes | - |