True Wireless
OnePlus Buds Pro 4
84Great
$130
Full review dataOnePlus Buds Pro 4 vs Technics EAH-AZ40: which should you buy?
On aggregated review scores the OnePlus Buds Pro 4 comes out ahead with an HearWiki score of 84. The full breakdown - sub-scores, specs and what reviewers actually said - is below.
Our pick: OnePlus Buds Pro 4 - Great overall at around $130.
True Wireless
Technics EAH-AZ40
68Good
$130
Full review dataScore breakdown
Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.
OnePlus Buds Pro 4
Sound8.5
Noise cancelling8.0
Battery8.5
Calls7.5
Value9.0
Technics EAH-AZ40
Sound7.0
Battery7.0
Calls7.0
Value7.0
Specifications
| Spec | OnePlus Buds Pro 4 | Technics EAH-AZ40 |
|---|---|---|
| Type | True Wireless | True Wireless |
| Price (USD) | $130 | $130 |
| HearWiki score | 84 / 100 · Great | 68 / 100 · Good |
| Released | 2026 | 2021 |
| Audio | ||
| Driver | dual drivers; 11mm woofer + 6mm tweeter | 6mm |
| Driver size | 11 mm | 6 mm |
| Drivers per side | 1 | 2 |
| Frequency response | 10Hz-40kHz | 20Hz-20kHz |
| Wireless | ||
| Bluetooth | 5.4 | 5.2 |
| Bluetooth version | - | 5.2 |
| Codecs | SBC, AAC, LHDC 5.0 | SBC, AAC |
| Multipoint pairing | Yes | Yes |
| Latency | 47 ms | - |
| Wireless range | 10 m | 10 m |
| Battery | ||
| Battery life | 13 h | 7.5 h |
| Battery life (ANC on) | 7 h | - |
| Battery incl. case | 45 h | 25 h |
| Full charge time | 70 min | 120 min |
| Quick charge | 10 min = 11 hours playback | 10 min = 90 min |
| Wireless charging | Yes | No |
| Features | ||
| Active noise cancelling | Yes | No |
| ANC type | adaptive | none |
| Transparency mode | Yes | No |
| Companion app | Yes | No |
| Custom EQ | Yes | No |
| Wear detection | Yes | No |
| Controls | touch | touch |
| Voice assistant | yes | voice assistant support |
| Design | ||
| Weight | 4.73 g | 5 g |
| Case weight | 50.62 g | 30 g |
| Water resistance | IP55 | IPX4 |
| USB-C | Yes | Yes |
| Model code | OnePlus Buds 4 | - |
| Calls | ||
| Microphones | 3 | 1 |
What reviewers said
OnePlus Buds Pro 4
The OnePlus Buds Pro 4 are a well-rounded pair of true wireless earbuds that deliver impressive audio, adaptive noise cancellation, and strong battery life for their price. They're particularly suited for active lifestyles thanks to their IP55 rating and secure fit, with a feature set that includes multipoint, wireless charging, and customizable EQ. Overall, they offer excellent value and perform above their price point across most key areas.
- Pro:Rich dual-driver sound with LHDC support
- Pro:Effective adaptive ANC and transparency mode
- Pro:Long battery life with wireless charging case
- Con:Touch controls may require a learning curve
- Con:No official mention of wear detection
- Con:Slightly bulky case compared to rivals
Technics EAH-AZ40
The Technics EAH-AZ40 earbuds deliver accurate audio and solid call quality in a lightweight, comfortable design, with useful extras like Bluetooth 5.2 and multipoint pairing. However, they lack active noise cancellation, wear detection, and advanced codecs, and their bass-heavy tuning can falter on complex rhythmic tracks. Overall, they are capable everyday buds that stop short of being top-tier due to missing premium features.
- Pro:Accurate, detailed sound signature
- Pro:Reliable multipoint connection via Bluetooth 5.2
- Pro:Lightweight and comfortable for extended wear
- Con:No active noise cancellation or wear sensors
- Con:Only SBC/AAC codecs, no aptX or LDAC
- Con:Bass can overpower rhythm in busy tracks
Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.
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