Why is Air Pro 4 better than Rail?
- Battery life11 h vs 9 h+22%
- Highest frequency40,000 Hz vs 20,000 Hz2×
- Bluetooth version5.4 vs 5.2+4%
- Driver size10 mm vs 6 mm+67%
Why is Rail better than Air Pro 4?
Rail has no measurable advantages in this pair.
Specifications
Side by side
| Sound | ||
| Fit | In-ear | In-ear |
| Driver type | Dynamic | — |
| Driver size | 10 mm | 6 mm |
| Lowest frequency | 20 Hz | 20 Hz |
| Highest frequency | 40,000 Hz | 20,000 Hz |
| Impedance | — | 16 Ω |
| Sensitivity | — | 100 dB |
| Hi-Res Audio | Yes | — |
| Adjustable equaliser | Yes | Yes |
| Noise control | ||
| Active noise cancelling | Yes | — |
| Adaptive ANC | Yes | — |
| Transparency / ambient mode | Yes | Yes |
| Microphones | 6 | — |
| Noise reduction for calls | Yes | — |
| Battery & charging | ||
| Battery life | 11 h | 9 h |
| Battery life with ANC | 7.5 h | — |
| Total with charging case | 52 h | — |
| Battery capacity | 54 mAh | — |
| Charging time | 1 h | — |
| Wireless charging (case) | Yes | — |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | 5.4 | 5.2 |
| Bluetooth codecs | LDAC, aptX Lossless, aptX | — |
| Hi-res codec (LDAC / aptX HD / LHDC) | Yes | — |
| aptX | Yes | — |
| LDAC | Yes | — |
| Multipoint (two devices) | Yes | Yes |
| LE Audio | Yes | — |
| Auracast | Yes | — |
| USB-C | Yes | Yes |
| Latency | 50 ms | — |
| Low-latency game mode | Yes | — |
| Smart & streaming | ||
| Companion app | Yes | — |
| Design & build | ||
| Weight | — | 49 g |
| Earbud weight (each) | 5.2 g | — |
| Protection rating | IPX5 | IP55 |
| Water resistance (IPx) | IPx5 | IPx5 |
| Dust protection (IP) | — | 5 |
| Features | ||
| Touch controls | Yes | — |
| Wear detection (auto pause) | Yes | — |
| Hands-free calls | Yes | Yes |
