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The short answer
Marshall Middleton II wins this comparison. Choose it if a longer advertised playtime matters. Marshall Middleton II advertises up to 30 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
Built for long weekends, with 30+ hours of playtime, 360° sound and phone charging. Bass and treble controls let you adjust the sound; expect 3.97 lb to carry.
Bettr Score
66.5/100
| Ultimate Ears WONDERBOOM 4 | Specification | Marshall Middleton II |
|---|---|---|
$99.99 ✓ Winner | Reference price | $329.99 |
14 hours | Advertised battery life | 30 hours ✓ Winner |
14.82 oz ✓ Winner | Weight | 3.97 lb |
IP67 | Ingress protectionTie | IP67 |
4 | Durability tierTie | 4 |
5.2 | Bluetooth versionPersonal preference | 5.3 |
No | Can charge another device | Yes ✓ Winner |
No | USB audio inputNot enough data | Not stated / not applicable |
No | Auracast or compatible broadcast pairing | Yes ✓ Winner |
Yes | Floats in waterNot enough data | Not stated / not applicable |
No | Speakerphone | Yes ✓ Winner |
The buying advice
Choose Ultimate Ears WONDERBOOM 4 if you want less weight in your bag. Ultimate Ears WONDERBOOM 4 weighs 14.82 oz versus 3.97 lb — 3.04 lb less to carry.
Choose Marshall Middleton II if a longer advertised playtime matters. Marshall Middleton II advertises up to 30 hours, versus up to 14 hours for Ultimate Ears WONDERBOOM 4.
Ultimate Ears WONDERBOOM 4 weighs 14.82 oz versus 3.97 lb — 3.04 lb less to carry. Marshall Middleton II advertises up to 30 hours, versus up to 14 hours for Ultimate Ears WONDERBOOM 4. The recorded reference-price difference is $230.00.
Ultimate Ears WONDERBOOM 4 weighs 14.82 oz versus 3.97 lb — 3.04 lb less to carry.
Marshall Middleton II advertises up to 30 hours, versus up to 14 hours for Ultimate Ears WONDERBOOM 4.
Marshall Middleton II can charge another device from its battery; the other speaker’s verified specification says it cannot. Charging a phone uses some of the speaker’s battery.
Ultimate Ears WONDERBOOM 4 has the lower recorded reference price: $99.99 versus $329.99, a $230.00 difference.
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
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eBay — New
In stock · checked Oct 30, 2026
Price needs rechecking. Confirm at the retailer.
$299.00
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
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