Between the MW09 and Liberty 4 Pro, the MW09 comes out ahead in battery — buds and battery — with case, while the Liberty 4 Pro wins on weight per bud. Overall, the MW09 scores 79.3 and the Liberty 4 Pro scores 72.8 on our Mars Score.
Which should you buy?
The MW09 edges ahead on the Mars Score (79.3 vs 72.8), but the 6.5-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the MW09 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. The biggest gaps in its favor are battery — buds, battery — with case, driver size, among others.
Pick the Liberty 4 Pro if you care most about weight per bud. Its strongest claims are weight per bud.
Both ship with comparable active noise cancellation, spatial audio, multipoint, so those specs don't separate the two — focus on the differences below.
Bottom line: the MW09 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Master & Dynamic - MW09 wins
- ▲Battery — buds — 60.00% more. 16 h vs 10 h.
- ▲Battery — with case — 20.00% more. 48 h vs 40 h.
- ▲Driver size — 4.76% more. 11 mm vs 10.5 mm.
- ▲Water resistance: IP57 (vs IPX4).
Why Anker - Liberty 4 Pro wins
- ▲Weight per bud — 0.40 g less. 5.6 vs 6.
Spec comparison
Design
| Spec | Master & Dynamic - MW09 | Anker - Liberty 4 Pro |
|---|---|---|
| Form factor | in-ear | in-ear |
| Weight per bud | 6 g | 5.6 glead |
| Water resistanceⓘ | IP57lead | IPX4 |
Audio
| Spec | Master & Dynamic - MW09 | Anker - Liberty 4 Pro |
|---|---|---|
| Driver sizeⓘ | 11 mmlead | 10.5 mm |
| Active noise cancellationⓘ | true | true |
| Transparency mode | true | true |
| Spatial audioⓘ | false | false |
Battery
| Spec | Master & Dynamic - MW09 | Anker - Liberty 4 Pro |
|---|---|---|
| Battery — buds | 16 hlead | 10 h |
| Battery — with case | 48 hlead | 40 h |
| Wireless case chargingⓘ | true | true |
Connectivity
| Spec | Master & Dynamic - MW09 | Anker - Liberty 4 Pro |
|---|---|---|
| Bluetoothⓘ | 5.4 | 5.4 |
| Codecs | aptX Lossless,aptX Adaptive,AAC,SBC | LDAC,AAC,SBC |
| Multipointⓘ | true | true |
| In-ear detection | true | true |
Frequently asked
Which has longer battery, MW09 or Liberty 4 Pro?+
MW09 lasts 16h per charge vs 10h.
Do MW09 or Liberty 4 Pro support multipoint?+
Both support multipoint pairing.
Which has ANC, MW09 or Liberty 4 Pro?+
Both have active noise cancellation.
Spec-level deep dives
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