Why is Rail better than AeroFit 2?
Rail has no measurable advantages in this pair.
Why is AeroFit 2 better than Rail?
- Battery life9 h vs 10 h+11%
- Driver size6 mm vs 16.2 mm2.7×
- Bluetooth version5.2 vs 5.4+4%
Specifications
Side by side
| Sound | ||
| Fit | In-ear | Open-ear |
| Ear cup design | — | Open-back |
| Driver type | — | Dynamic |
| Driver size | 6 mm | 16.2 mm |
| Number of drivers | — | 1 |
| Lowest frequency | 20 Hz | 20 Hz |
| Highest frequency | 20,000 Hz | 20,000 Hz |
| Impedance | 16 Ω | 16 Ω |
| Sensitivity | 100 dB | — |
| Hi-Res Audio | — | Yes |
| Adjustable equaliser | Yes | Yes |
| Noise control | ||
| Active noise cancelling | — | No |
| Transparency / ambient mode | Yes | — |
| Microphones | — | 4 |
| Battery & charging | ||
| Battery life | 9 h | 10 h |
| Total with charging case | — | 42 h |
| Charging time | — | 1 h |
| Quick charge (claimed) | — | 10 min → 4 h |
| Fast charging support | — | Yes |
| Wireless charging (case) | — | Yes |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | 5.2 | 5.4 |
| Bluetooth codecs | — | LDAC |
| Hi-res codec (LDAC / aptX HD / LHDC) | — | Yes |
| aptX | — | No |
| LDAC | — | Yes |
| Multipoint (two devices) | Yes | Yes |
| USB-C | Yes | Yes |
| Smart & streaming | ||
| Companion app | — | Yes |
| Design & build | ||
| Weight | 49 g | — |
| Earbud weight (each) | — | 10 g |
| Protection rating | IP55 | IP55 |
| Water resistance (IPx) | IPx5 | IPx5 |
| Dust protection (IP) | 5 | 5 |
| Colours | — | Midnight Black, Pearl White, Minty Green, Midnight Blue, Brown |
| Features | ||
| Touch controls | — | Yes |
| Hands-free calls | Yes | Yes |
