vs
2.7Battery life2.4
Dimensions
Size comparison
Approach S40Forerunner 245
| Approach S40 | Forerunner 245 | Difference | |
|---|---|---|---|
| Height | 43.4 mm | 42.3 mm | +1.1 mm |
| Width | 43.4 mm | 42.3 mm | +1.1 mm |
| Thickness | 11.7 mm | 12.2 mm | −0.5 mm |
| Weight | 43 g | 38 g | +4 g |
Drawn to the same scale from the official dimensions (front and side).
Why is Approach S40 better than Forerunner 245?
- Battery life (smartwatch mode)10 days vs 7 days+43%
- Thickness11.7 mm vs 12.2 mm+4%
Why is Forerunner 245 better than Approach S40?
- GPS battery life15 h vs 24 h+60%
- Sport profiles2 vs 168×
- Storage0.06 GB vs 4 GB66.7×
- Weight43 g vs 38.5 g+12%
Specifications
Side by side
| Design & durability | ||
| Case size | 43 mm | 42 mm |
| Weight | 43 g | 38.5 g |
| Thickness | 11.7 mm | 12.2 mm |
| Height | 43.4 mm | 42.3 mm |
| Width | 43.4 mm | 42.3 mm |
| Case material | — | Plastic / polymer |
| Sapphire crystal | No | No |
| Lens / cover glass | chemically strengthened glass | Corning® Gorilla® Glass 3 |
| Strap material | silicone | silicone |
| Water resistance | — | 5 ATM |
| Water rating (maker) | — | 5 ATM |
| Display | ||
| Screen size | 1.2″ | 1.2″ |
| Display technology | — | Memory-in-pixel (transflective) |
| Panel | — | Sunlight-visible, transflective memory-in-pixel |
| AMOLED / OLED display | — | No |
| Always-on display | — | Yes |
| Resolution (width) | 240 px | 240 px |
| Resolution (height) | 240 px | 240 px |
| Pixel density | 200 ppi | 200 ppi |
| Battery | ||
| Battery life (smartwatch mode) | 10 days | 7 days |
| GPS battery life | 15 h | 24 h |
| Wireless charging | No | No |
| Charging | Garmin proprietary plug charger | Garmin proprietary plug charger |
| Health sensors | ||
| Optical heart rate | — | Yes |
| Blood oxygen (SpO2) | — | Yes |
| Temperature sensor | — | Yes |
| Sleep tracking | — | Yes |
| Sensors | GPS, Gyroscope, Accelerometer | GPS, GLONASS, Galileo, Elevate wrist heart rate monitor, Pulse Ox blood oxygen saturation monitor, Compass, Accelerometer, Thermometer |
| Sports & navigation | ||
| Built-in GPS | Yes | Yes |
| Satellite systems | — | GLONASS, GALILEO |
| Compass | — | Yes |
| Sport profiles | 2 | 16 |
| Connectivity | ||
| ANT+ sensors | — | Yes |
| Smart features | ||
| Storage | 0.06 GB | 4 GB |
| Third-party apps | — | Yes |
| Platform | ||
| Operating system | Garmin OS | Garmin OS |
| Platform | Proprietary | Proprietary |
| Works with | iOS, Android | iOS, Android |
