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The short answer
Marshall Willen II wins this comparison. Choose it if a longer advertised playtime matters. Marshall Willen II advertises up to 17 hours, versus up to 14 hours for Ultimate Ears WONDERBOOM 4.
Ultimate Ears
A small poolside speaker that floats, with 360° playback and up to 14 hours of battery life. Outdoor Boost and Podcast Mode cover music outside and spoken audio.
Bettr Score
63.8/100
Marshall
A 12.7 oz speaker with a strap for attaching to your bag. IP67 protection, 17+ hours of playtime and hands-free calls make it a practical option for travelling light.
Bettr Score
65/100
| Ultimate Ears WONDERBOOM 4 | Specification | Marshall Willen II |
|---|---|---|
$99.99 ✓ Winner | Reference price | $129.99 |
14 hours | Advertised battery life | 17 hours ✓ Winner |
14.82 oz | Weight | 12.7 oz ✓ Winner |
IP67 | Ingress protectionTie | IP67 |
4 | Durability tierTie | 4 |
5.2 | Bluetooth versionPersonal preference | 5.3 |
No | Can charge another deviceNot enough data | Not stated / not applicable |
No | USB audio inputNot enough data | Not stated / not applicable |
No | Auracast or compatible broadcast pairingNot enough data | Not stated / not applicable |
Yes | Floats in waterNot enough data | Not stated / not applicable |
No | Speakerphone | Yes ✓ Winner |
The buying advice
Choose Ultimate Ears WONDERBOOM 4 if a lower purchase price is your priority. Ultimate Ears WONDERBOOM 4 has the lower recorded reference price: $99.99 versus $129.99, a $30.00 difference.
Choose Marshall Willen II if a longer advertised playtime matters. Marshall Willen II advertises up to 17 hours, versus up to 14 hours for Ultimate Ears WONDERBOOM 4.
Ultimate Ears WONDERBOOM 4 has the lower recorded reference price: $99.99 versus $129.99, a $30.00 difference. Marshall Willen II advertises up to 17 hours, versus up to 14 hours for Ultimate Ears WONDERBOOM 4.
Ultimate Ears WONDERBOOM 4 has the lower recorded reference price: $99.99 versus $129.99, a $30.00 difference.
Marshall Willen II advertises up to 17 hours, versus up to 14 hours for Ultimate Ears WONDERBOOM 4.
Marshall Willen II weighs 12.7 oz versus 14.82 oz — 2.12 oz less to carry.
Marshall Willen II supports speakerphone calls; the other speaker’s verified specification says it does not.
People's Pick
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eBay — New
In stock · checked Oct 30, 2026
Price needs rechecking. Confirm at the retailer.
$58.49
Item + shipping · before tax
$58.49 + $0.00 shipping
We may earn a commission when you buy through links marked “Affiliate link.” This does not change your price or our scores. How we earn
eBay — New
In stock · checked Oct 30, 2026
Price needs rechecking. Confirm at the retailer.
$79.99
Item price · shipping unknown
We may earn a commission when you buy through links marked “Affiliate link.” This does not change your price or our scores. How we earn
Compare Portable Speakers
