vs
5.7Noise control & calls4.8
9.3Battery4.4
4.1Build & features5.2
Why is Tune 255NC better than Flex Open Earbuds?
- Active noise cancellingYes · Flex Open Earbuds: No
- Battery life12 h vs 7 h+71%
- Total with charging case48 h vs 21 h2.3×
Why is Flex Open Earbuds better than Tune 255NC?
- Weight52 g vs 49 g+7%
- Driver size10 mm vs 12 mm+20%
- Battery capacity65 mAh vs 70 mAh+8%
Specifications
Side by side
| Sound | ||
| Fit | In-ear | Open-ear |
| Ear cup design | — | Open-back |
| Driver type | — | Dynamic |
| Driver size | 10 mm | 12 mm |
| Lowest frequency | 20 Hz | 20 Hz |
| Highest frequency | 20,000 Hz | 20,000 Hz |
| Impedance | 16 Ω | 12 Ω |
| Sensitivity | 100 dB | — |
| Adjustable equaliser | — | Yes |
| Noise control | ||
| Active noise cancelling | Yes | No |
| Adaptive ANC | Yes | — |
| Transparency / ambient mode | Yes | Yes |
| Microphones | — | 4 |
| Noise reduction for calls | — | Yes |
| Battery & charging | ||
| Battery life | 12 h | 7 h |
| Battery life with ANC | 12 h | — |
| Total with charging case | 48 h | 21 h |
| Battery capacity | 65 mAh | 70 mAh |
| Charging time | 2 h | 2 h |
| Quick charge (claimed) | — | 10 min → 1 h |
| Fast charging support | — | Yes |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | 5.3 | 5.4 |
| Bluetooth codecs | — | SBC |
| Hi-res codec (LDAC / aptX HD / LHDC) | — | No |
| aptX | — | No |
| LDAC | — | No |
| Multipoint (two devices) | Yes | Yes |
| USB-C | Yes | Yes |
| Latency | — | 200 ms |
| Low-latency game mode | — | Yes |
| Smart & streaming | ||
| Voice assistant | — | Google Assistant, Siri |
| Companion app | Yes | Yes |
| Design & build | ||
| Weight | 52 g | 49 g |
| Protection rating | IP54 | IPX4 |
| Water resistance (IPx) | IPx4 | IPx4 |
| Dust protection (IP) | 5 | 5 |
| Colours | Black | Black, Teal, White |
| Features | ||
| Touch controls | — | Yes |
| Hands-free calls | — | Yes |
