vs
5.0Display3.5
2.3Battery life4.8
4.9Health tracking4.9
2.7Sports & outdoor5.0
4.0Smart features6.5
2.5Build & durability2.7
Dimensions
Size comparison
D2 Air X10Forerunner 255 Music
| D2 Air X10 | Forerunner 255 Music | Difference | |
|---|---|---|---|
| Height | 43.6 mm | 45.6 mm | −2 mm |
| Width | 43.6 mm | 45.6 mm | −2 mm |
| Thickness | 12.6 mm | 12.9 mm | −0.3 mm |
| Weight | 51 g | 49 g | +2 g |
Drawn to the same scale from the official dimensions (front and side).
Why is D2 Air X10 better than Forerunner 255 Music?
- AMOLED / OLED displayYes · Forerunner 255 Music: No
- Resolution (width)416 px vs 260 px+60%
- Pixel density320 ppi vs 200 ppi+60%
- Thickness12.6 mm vs 12.9 mm+2%
Why is Forerunner 255 Music better than D2 Air X10?
- Battery life (smartwatch mode)7 days vs 14 days2×
- GPS battery life24 h vs 30 h+25%
- Sport profiles24 vs 582.4×
- Weight51 g vs 49 g+4%
Specifications
Side by side
| Design & durability | ||
| Case size | 44 mm | 46 mm |
| Weight | 51 g | 49 g |
| Thickness | 12.6 mm | 12.9 mm |
| Height | 43.6 mm | 45.6 mm |
| Width | 43.6 mm | 45.6 mm |
| Case material | Stainless steel | Plastic / polymer |
| Sapphire crystal | No | No |
| Lens / cover glass | Corning® Gorilla® Glass 3 | Corning® Gorilla® Glass 3 |
| Strap material | silicone | silicone |
| Water resistance | 5 ATM | 5 ATM |
| Water rating (maker) | Swim, 5 ATM | 5 ATM |
| Display | ||
| Screen size | 1.3″ | 1.3″ |
| Display technology | AMOLED | Memory-in-pixel (transflective) |
| Panel | AMOLED | Sunlight-visible, transflective memory-in-pixel |
| AMOLED / OLED display | Yes | No |
| Always-on display | Yes | Yes |
| Touchscreen | Yes | — |
| Resolution (width) | 416 px | 260 px |
| Resolution (height) | 416 px | 260 px |
| Pixel density | 320 ppi | 200 ppi |
| Battery | ||
| Battery life (smartwatch mode) | 7 days | 14 days |
| Battery saver mode | 10 days | — |
| GPS battery life | 24 h | 30 h |
| GPS battery life (dual-band) | — | 16 h |
| Battery type | — | Lithium ion |
| Wireless charging | No | No |
| Charging | Garmin proprietary plug charger | Garmin proprietary plug charger |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| Temperature sensor | Yes | Yes |
| HRV tracking | — | Yes |
| Sleep tracking | Yes | Yes |
| Sensors | GPS, GLONASS, Galileo, Elevate wrist heart rate monitor, Pulse Ox blood oxygen saturation monitor, Barometric altimeter, Compass, Gyroscope, Accelerometer, Thermometer, Ambient light sensor | GPS, GLONASS, Galileo, QZSS, BeiDou, SatIQ technology, Elevate wrist heart rate monitor, Pulse Ox blood oxygen saturation monitor, Barometric altimeter, Compass, Gyroscope, Accelerometer, Thermometer |
| Sports & navigation | ||
| Built-in GPS | Yes | Yes |
| Dual-band GPS | — | Yes |
| Satellite systems | GLONASS, GALILEO | GLONASS, GALILEO, BDS, QZSS |
| Barometric altimeter | Yes | Yes |
| Compass | Yes | Yes |
| Multisport / triathlon mode | — | Yes |
| Sport profiles | 24 | 58 |
| Connectivity | ||
| NFC payments | Yes | Yes |
| Wi-Fi | Wi-Fi 4 | Wi-Fi 4 |
| ANT+ sensors | Yes | Yes |
| Smart features | ||
| Calls from the wrist | Yes | — |
| Voice assistant | Yes | — |
| Music on the watch | Yes | Yes |
| Storage | — | 4 GB |
| Third-party apps | Yes | Yes |
| Platform | ||
| Operating system | Garmin OS | Garmin OS |
| Platform | Proprietary | Proprietary |
| Works with | iOS, Android | iOS, Android |
