JLab Flex EFLEXRBLK124
Its open-ear clip-on design delivers 21-hour total battery life and 12mm drivers for booming open sound without blocking ambient noise. Multipoint Bluetooth 5.3 effortlessly switches between two devices, and the JLab App provides custom EQ for the lightweight 59-gram build. This makes it ideal for runners, cyclists, and desk workers who need all-day awareness during calls and music.
form factor open-ear
Wireless Yes
bluetooth version 5.3
battery life hours 6
case battery hours 21
water resistance Yes
multipoint Yes
46 Overall Score
Price ¥8,910
Snapshot
Pros & Cons
Pros
- Strong connectivity (90th percentile) 90th
- Strong mic (80th percentile) 80th
- Strong comfort (71th percentile) 71th
Cons
- Below average battery (20th percentile)
- Below average anc (29th percentile)
- Below average build (33th percentile)
What owners think
How owner sentiment changed over time
ExclusiveBased on when customers actually wrote their reviews — so you can see whether early praise held up.
Owner sentiment has held steady over time
Based on 200 dated customer reviews, grouped by calendar quarter. Period analysis is in English.
The proof
Performance
Specifications
Full Specifications
Design
| Form Factor | open-ear |
| Wearing Style | clip on |
| Weight | 0.1 kg / 0.1 lbs |
Audio
| Driver Size | 12 |
| Freq Min | 20 |
| Freq Max | 20000 |
| Impedance | 12 |
Connectivity
| Wireless | Yes |
| Bluetooth | 5.3 |
| Multipoint | Yes |
Earbud Battery
| Battery Life | 6 |
| Charge Time | 2 |
| Charging | USB-C |
Case Battery
| Case Battery | 21 |
| Case Charging | USB-C |
Microphone
| Microphone | Yes |
| Mic Count | 2 |
| NC Mic | Yes |
Features
| Touch Controls | Yes |
| App | JLab App |
| Water Resistance | Yes |
vs Competition
| Spec | JLab Flex EFLEXRBLK124 | Technics EAH-AZ100 EAH-AZ100 | Sony LinkBuds Fit WFLS910N/B | EarFun Air Pro Air Pro 4+ | Bose QuietComfort Ultra 896637-0050 | SoundPEATS H3 H3 |
|---|---|---|---|---|---|---|
| Form Factor | open-ear | in-ear | in-ear | in-ear | in-ear | in-ear |
| Driver Type | - | Dynamic | dynamic | hybrid | dynamic | hybrid |
| Wireless | true | true | true | true | true | true |
| Active Noise Cancellation | - | true | true | true | true | true |
| Bluetooth Version | 5.3 | 5.3 | 5.3 | 6.0 | 5.3 | 5.4 |
| Battery Life Hours | 6 | 8 | 5.5 | 12 | 6 | 7 |
| Case Battery Hours | 21 | 28 | 21 | 54 | 18 | 37 |
| Water Resistance | Yes | IPX4 | IPX4 | IP55 | IPX4 | IPX5 |
| Multipoint | true | true | true | true | true | true |
| Compare | Compare | Compare | Compare | Compare |
| Product | Anc | Mic | Build | Sound | Battery | Comfort | Connectivity | Social Proof |
|---|---|---|---|---|---|---|---|---|
| JLab Flex EFLEXRBLK124 | 28.9 | 80.1 | 33.3 | 50.5 | 19.8 | 70.6 | 89.9 | 57 |
| Technics EAH-AZ100 EAH-AZ100 Compare | 96.7 | 96.8 | 78.6 | 99 | 78.9 | 93.3 | 99.8 | 64.6 |
| Sony LinkBuds Fit WFLS910N/B Compare | 96.7 | 65.3 | 78.6 | 97.8 | 66 | 93.3 | 97.2 | 57 |
| EarFun Air Pro Air Pro 4+ Compare | 96.7 | 96.8 | 91 | 99.8 | 95.9 | 70.6 | 99.3 | 86.1 |
| Bose QuietComfort Ultra 896637-0050 Compare | 96.7 | 80.1 | 78.6 | 96.2 | 46.9 | 93.3 | 97.7 | 97.6 |
| SoundPEATS H3 H3 Compare | 96.7 | 96.8 | 91 | 99.9 | 80.6 | 70.6 | 89.9 | 94.2 |
Price
Value & Pricing
From ¥8,910
Amazon.co.jp 1 offers From ¥8,910
May 30, 2026 ¥8,910
Usage Scores
A full written review is coming soon. The specs, scores, prices and charts above are always up to date.
