8.5Battery4.5
Why is Comfo Flex better than C40i?
- Battery life10 h vs 7 h+43%
- Hi-res codec (LDAC / aptX HD / LHDC)Yes · C40i: No
- Total with charging case40 h vs 21 h+90%
- Water resistance (IPx)IPx5 vs IPx4+25%
- Highest frequency40,000 Hz vs 20,000 Hz2×
- LDACYes · C40i: No
Why is C40i better than Comfo Flex?
C40i has no measurable advantages in this pair.
Specifications
Side by side
| Sound | ||
| Fit | Open-ear | In-ear |
| Ear cup design | — | Open-back |
| Driver type | — | Dynamic |
| Driver size | — | 12 mm |
| Number of drivers | — | 1 |
| Lowest frequency | 20 Hz | 20 Hz |
| Highest frequency | 40,000 Hz | 20,000 Hz |
| Impedance | — | 22 Ω |
| Sensitivity | 90 dB | — |
| Hi-Res Audio | — | Yes |
| Adjustable equaliser | — | Yes |
| Noise control | ||
| Active noise cancelling | — | No |
| Battery & charging | ||
| Battery life | 10 h | 7 h |
| Total with charging case | 40 h | 21 h |
| Battery capacity | 70 mAh | — |
| Charging time | — | 1 h |
| Quick charge (claimed) | — | 10 min → 5 h |
| Fast charging support | — | Yes |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | 5.4 | 5.4 |
| Bluetooth codecs | LDAC, AAC, SBC | AAC, SBC |
| Hi-res codec (LDAC / aptX HD / LHDC) | Yes | No |
| aptX | No | No |
| LDAC | Yes | No |
| Multipoint (two devices) | — | Yes |
| USB-C | Yes | Yes |
| Design & build | ||
| Earbud weight (each) | — | 5.8 g |
| Protection rating | IP55 | IPX4 |
| Water resistance (IPx) | IPx5 | IPx4 |
| Dust protection (IP) | 5 | — |
| Colours | — | Midnight Black, Desert Bronze, Clarity Black |
| Features | ||
| Touch controls | — | Yes |
| Hands-free calls | — | Yes |
