vs
5.0Noise control & calls7.2
4.5Battery2.4
4.6Build & features3.8
Why is Flex Open Earbuds better than E3?
- Battery life7 h vs 4.5 h+56%
- Weight49 g vs 51 g+5%
- Driver size12 mm vs 10 mm+20%
Why is E3 better than Flex Open Earbuds?
- Active noise cancellingNo · Flex Open Earbuds: Yes
Specifications
Side by side
| Sound | ||
| Fit | Open-ear | In-ear |
| Ear cup design | Open-back | — |
| Driver type | Dynamic | Dynamic |
| Driver size | 12 mm | 10 mm |
| Lowest frequency | 20 Hz | — |
| Highest frequency | 20,000 Hz | — |
| Impedance | 12 Ω | 16 Ω |
| Sensitivity | — | 99 dB |
| Adjustable equaliser | Yes | — |
| Noise control | ||
| Active noise cancelling | No | Yes |
| Transparency / ambient mode | Yes | Yes |
| Microphones | 4 | — |
| Noise reduction for calls | Yes | — |
| Battery & charging | ||
| Battery life | 7 h | 4.5 h |
| Total with charging case | 21 h | — |
| Battery capacity | 70 mAh | — |
| Charging time | 2 h | — |
| Quick charge (claimed) | 10 min → 1 h | — |
| Fast charging support | Yes | — |
| Wireless charging (case) | — | Yes |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | 5.4 | 5.3 |
| Bluetooth codecs | SBC | AAC, SBC |
| Hi-res codec (LDAC / aptX HD / LHDC) | No | No |
| aptX | No | No |
| LDAC | No | 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 | — |
| Design & build | ||
| Weight | 49 g | 51 g |
| Protection rating | IPX4 | IPX4 |
| Water resistance (IPx) | IPx4 | IPx4 |
| Dust protection (IP) | 5 | — |
| Colours | Black, Teal, White | — |
| Features | ||
| Touch controls | Yes | Yes |
| Hands-free calls | Yes | Yes |
