Why is Buds 4 better than AeroFit 2?
- Active noise cancellingYes · AeroFit 2: No
- Battery life11 h vs 10 h+10%
- Highest frequency40,000 Hz vs 20,000 Hz2×
- Total with charging case45 h vs 42 h+7%
- Lowest frequency15 Hz vs 20 Hz+33%
Why is AeroFit 2 better than Buds 4?
- Microphones2 vs 42×
- LDACNo · Buds 4: Yes
- Charging time1.2 h vs 1 h+20%
Specifications
Side by side
| Sound | ||
| Fit | In-ear | Open-ear |
| Ear cup design | — | Open-back |
| Driver type | — | Dynamic |
| Driver size | — | 16.2 mm |
| Number of drivers | — | 1 |
| Lowest frequency | 15 Hz | 20 Hz |
| Highest frequency | 40,000 Hz | 20,000 Hz |
| Impedance | 18 Ω | 16 Ω |
| Sensitivity | 38 dB | — |
| Hi-Res Audio | Yes | Yes |
| Adjustable equaliser | — | Yes |
| Noise control | ||
| Active noise cancelling | Yes | No |
| Transparency / ambient mode | Yes | — |
| Microphones | 2 | 4 |
| Battery & charging | ||
| Battery life | 11 h | 10 h |
| Battery life with ANC | 6 h | — |
| Total with charging case | 45 h | 42 h |
| Charging time | 1.2 h | 1 h |
| Quick charge (claimed) | — | 10 min → 4 h |
| Fast charging support | Yes | Yes |
| Wireless charging (case) | — | Yes |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | 5.4 | 5.4 |
| Bluetooth codecs | LHDC, AAC, SBC | LDAC |
| Hi-res codec (LDAC / aptX HD / LHDC) | Yes | Yes |
| aptX | No | No |
| LDAC | No | Yes |
| Multipoint (two devices) | — | Yes |
| USB-C | Yes | Yes |
| Low-latency game mode | 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 |
