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Ultimate Ears

Ultimate Ears WONDERBOOM 4 Portable Waterproof Speaker

Portable Bluetooth Speaker

4.3/ 5 on Amazon2,600Amazon ratings3,000+bought last month2.7ProductDome score

Limited evidenceUpdated 8 days agoAmazon data + ProductDome analysis · methodology

Best forYou want a small speaker that can be dropped, splashed or submerged without concern

A compact waterproof speaker built to survive drops and dunks, with real stereo pairing and dedicated modes for outdoor and podcast listening.

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ProductDome scorecard

How it ranks among the 25 portable bluetooth speakers we track

2.7/ 5ProductDome scoreLimited evidence

Owner satisfaction · 56% of scorecategory median 4.6★4.3

4.3★ across 2,600 Amazon ratings, Bayesian-smoothed toward the category average.

Evidence strength · 17% of scorecategory median 13,200 ratings4.3

2,600 Amazon ratings, weighted on a log scale so huge counts don't drown everything.

Buyer demand · 11% of score4.7

3,000+ bought on Amazon last month.

Data quality · 11% of score2.5

Brand identity, imagery, description and spec coverage.

The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 25 portable bluetooth speakers we track - how the scorecard works · full portable bluetooth speakers data report. Confidence: limited - incomplete product information.Updated 8 days ago. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.

Overview

A small, waterproof Bluetooth speaker with 360 degree sound, an IP67 rating for full submersion, and up to 14 hours of playtime on a charge. It floats, has a 131 foot wireless range, and pairs with a second unit for stereo.

Two dedicated modes sit on top of standard playback: an Outdoor Boost button that adjusts the sound for open-air listening, and a newer Podcast Mode aimed at making spoken vocals clearer than the default music tuning. The plastic housing uses at least 31% recycled material by weight, and the speaker is rated as drop-proof from 5 feet.

IP67 waterproof, dustproof and floats
Up to 14 hours of playtime, 131 foot wireless range
Outdoor Boost and Podcast Mode listening presets
At least 31% recycled plastic by weight

Who it's for

Pool, beach and shower use where a speaker might get wet, dropped or dunked. Not the choice for anyone wanting deep bass or a home-theater scale sound field, since the design favors portability and durability over output size.

Strengths and trade-offs

Drawn from this product's published specifications.

What stands out

IP67 sealed against dust and full submersion, and it floats
360 degree sound does not need to face the listener
Up to 14 hours of playtime per charge
Pairs with a second unit for true stereo

What to check first

Charges via USB-C cable that is not included
Stereo pairing does not work together with the PartyUp multi-speaker mode

Performance notes

The IP67 rating means the housing is sealed against both dust and full submersion up to 1 meter for 30 minutes, which is what allows it to float and survive pool or beach use rather than just splashes. The 360 degree driver arrangement spreads sound outward instead of firing from one face, so placement in a room or outdoors matters less than with a directional speaker. Outdoor Boost re-tunes the output for open spaces where sound dissipates faster, while Podcast Mode narrows the EQ toward vocal clarity for spoken content.

Specifications

Brand	Ultimate Ears

How it compares

This product against the closest alternatives we track in portable bluetooth speakers.

Product	Amazon rating	Ratings	ProductDome score
Ultimate Ears WONDERBOOM 4 Portable Waterproof SpeakerThis product	4.3 / 5	2,600	2.7 / 5
JBL FLIP 5, Waterproof Portable Bluetooth Speaker, Black, Small \| Sounds better than…JBL	4.8 / 5	85,400	4.7 / 5
Soundcore Select 4 Go Bluetooth Shower Speaker by AnkerSoundcore	4.7 / 5	13,200	4.6 / 5
Soundcore Anker MiniAnker	4.6 / 5	93,300	4.6 / 5
Bose SoundLink Flex Bluetooth SpeakerBose	4.7 / 5	12,900	4.6 / 5

Frequently asked

Questions about the Ultimate Ears portable bluetooth speakers

Common buyer questions answered straight from the product spec data - no fluff, no "it depends".

Can the Ultimate Ears WONDERBOOM 4 go underwater?

Yes, it is IP67 rated for submersion in up to 1 meter of water for 30 minutes, and it floats.

How long does the WONDERBOOM 4 play on a charge?

Up to 14 hours, charged over USB-C, cable not included.

Can I pair two WONDERBOOM 4 speakers together?

Yes, pressing the pairing button once doubles the sound, and pressing again gives true left and right stereo between the two units.