Garmin D2 Air X15 vs Garmin Forerunner 55 comparison
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| key specs |
| Strap Colour | Black | Aqua, Black, White |
| Display Size | 35mm | 44mm |
| Compatible OS | Android and iOS | - |
| Strap Material | Silicone | Silicone |
| Dial Shape | Round | Round |
| Display Type | AMOLED | MIP |
| Ideal For | Unisex | Unisex |
| general |
| Brand | Garmin | Garmin |
| Model | D2 Air X15 | Forerunner 55 |
| Release date | October 22, 2025 | June 2, 2021 |
| Model Name | Garmin D2 Air X15 | - |
| Dial Shape | Round | Round |
| Strap Colour | Black | Aqua, Black, White |
| Strap Material | Silicone | Silicone |
| Size | Regular | Large |
| Water Resistance Depth | 5 ATM | 50 |
| Usage | Fitness & Outdoor | - |
| Ideal For | Unisex | Unisex |
| Water Resistant | - | 5ATM |
| Dial Colour | - | Black |
| dimensions |
| Weight (g) | 38.00 | 37.00 |
| Width | - | 42 |
| Height | - | 42 |
| Thickness | - | 11.6 |
| Diameter | - | 1.04 |
| product details |
| Sensor | Heart Rate Monitor, Stress, Sleep, Pulse Ox blood oxygen | - |
| Compatible Device | Android and iOS | - |
| Notification | Call Notification, Smartphone Apps Notifications | Yes |
| Battery Life | 10 days | - |
| Notification Type | - | Smart |
| Rechargeable Battery | - | Yes |
| connectivity features |
| Call Function | Yes | - |
| Bluetooth | Yes | - |
| Third Party App Support | Yes | - |
| Call Features | Make and Receive calls | - |
| Other Connectivity Features | GPS, Galileo, Glonass, Beidou, QZSS | - |
| GPS | - | Yes |
| platform and storage features |
| Compatible Operating System | Android and iOS | - |
| RAM | 8GB | - |
| camera and display features |
| Display Resolution | 454 x 454 | 208x208 |
| Display Size | 35mm | 44mm |
| Display Type | AMOLED | MIP |
| Other Display Features | - | Chemically Strengthened Glass |
| fitness and watch functions |
| Step Count | Yes | Yes |
| Calorie Count | Yes | Yes |
| Heart Rate Monitor | Yes | Yes |
| Altimeter | Yes | - |
| Compass | Yes | Yes |
| Calendar | Yes | Yes |
| Alarm Clock | Yes | Yes |
| Date & Time Display | Yes | Yes |
| Language | English | - |
| Number of Buttons | - | 2 |
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