Dimensions
Size comparison
Pro 4 AirStreet X
| Pro 4 Air | Street X | Difference | |
|---|---|---|---|
| Case size | 47 mm | 45 mm | +2 mm |
| Thickness | 9.9 mm | 13.8 mm | −3.9 mm |
Drawn to the same scale from the official dimensions (front and side).
Why is Pro 4 Air better than Street X?
- Screen size1.56″ vs 1.28″+22%
- Thickness9.9 mm vs 13.8 mm+39%
- Resolution (width)480 px vs 416 px+15%
- Battery capacity440 mAh vs 385 mAh+14%
Why is Street X better than Pro 4 Air?
- Battery life (smartwatch mode)5 days vs 10 days2×
Specifications
Side by side
| Design & durability | ||
| Case size | 47 mm | 45 mm |
| Weight | — | 48 g |
| Thickness | 9.9 mm | 13.8 mm |
| Height | — | 45 mm |
| Width | — | 45 mm |
| Case material | Stainless steel | Plastic / polymer |
| Water resistance | — | 5 ATM |
| Water rating (maker) | — | WR50 |
| Military-grade (MIL-STD-810) | — | Yes |
| Colours | — | Night Black, Snow White, Forest Green |
| Display | ||
| Screen size | 1.56″ | 1.28″ |
| Display technology | AMOLED | AMOLED |
| Panel | AMOLED | AMOLED |
| AMOLED / OLED display | Yes | Yes |
| Always-on display | Yes | — |
| Touchscreen | — | Yes |
| Resolution (width) | 480 px | 416 px |
| Resolution (height) | 480 px | 416 px |
| Pixel density | — | 325 ppi |
| Battery | ||
| Battery life (smartwatch mode) | 5 days | 10 days |
| GPS battery life | — | 42 h |
| Battery capacity | 440 mAh | 385 mAh |
| Battery type | — | Li-Pol |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | — |
| ECG | Yes | — |
| Skin temperature | Yes | Yes |
| Temperature sensor | — | Yes |
| HRV tracking | Yes | Yes |
| Sleep tracking | Yes | Yes |
| Sensors | heart rate, SpO2 | Barometer, Magnetometer compass, Accelerometer, Gyroscope |
| Sports & navigation | ||
| Built-in GPS | — | Yes |
| Offline maps | — | No |
| Barometric altimeter | — | Yes |
| Compass | — | Yes |
| LED flashlight | — | Yes |
| Connectivity | ||
| Bluetooth | 5.1 | — |
| Platform | ||
| Operating system | — | Polar OS |
| Platform | — | Proprietary |
| Works with | iOS, Android | Android, iOS |
| Chipset | Jieli AC7013A | — |
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