Ultimate Ears Wonderboom 4 Review: Built for the Outdoors

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Overview

The Ultimate Ears Wonderboom 4 is a palm-sized speaker built for the bag you take outdoors. It plays in a full circle, takes dust, water and drops in its stride, and floats if it ends up in the pool. Tom’s Guide suggested it might be the best Bluetooth speaker for a camping pack with no room to spare.

This fourth generation, released in June 2024, uses the same drivers as the Wonderboom 3 and looks almost identical. Most testers heard no difference in sound, though Tom’s Guide found a small improvement all round. The real changes are USB-C charging in place of the old micro-USB port and a new Podcast sound mode. It was $64.99 on Amazon in October 2026.

Key Specifications

Ultimate Ears Wonderboom 4 Sound Quality

Its two active drivers and two passive radiators fire in every direction, so it sounds much the same wherever you sit. That matters on a picnic blanket or a campsite table, where nobody is in front of the speaker. RTINGS found this design gives a more even sound across listening angles than the front-firing JBL Go 5.

The tuning leans on the middle of the range, and testers split on the low end. Tom’s Guide found the mids lead, so vocals and guitars get top billing, but wanted more body from bass-heavy tracks; TechRadar said the bass “has no business being so punchy for such a small speaker”. Either way, it sounds much bigger than it looks.

Turn it up close to the limit and it loses composure. Several testers heard harsh treble or thinning detail at the top of the dial, and SoundGuys found the speaker’s processing starts cutting bass once the phone passes about 60% volume. Tom’s Guide put the sweet spot at around three-quarters.

How loud it gets depends on who you ask: Tom’s Guide found it goes very, very loud, while RTINGS listed “Can’t get very loud” among its cons. Ultimate Ears rates the maximum at 86 dBC, or 87 dBC with Outdoor Boost, enough to fill a small or medium room. Think a few friends on a deck rather than a crowd in a park.

Waterproofing, Durability and Size

This is where the Wonderboom 4 earns its place in a bag. Its IP67 rating means it is sealed against dust and survives 30 minutes in up to 1 m of water, it floats, and Ultimate Ears drop-tests it from 1.5 m (5 ft). The USB-C port has its own sealing door, so sand and water stay out. Ultimate Ears backs it with a two-year limited hardware warranty.

The rubberized top and bottom and the fabric-wrapped middle feel solid in the hand, and the shape is essentially unchanged from the Wonderboom 3. At 420 g (14.82 oz) and 104 mm tall it fits a backpack side pocket, but it is chunkier than clip-style rivals: RTINGS found the JBL Clip 5 more portable, with a sturdy built-in hook. The Wonderboom’s elastic loop takes a carabiner (sold separately) for hanging it off a pack, though Tom’s Guide found the strap of little use for attaching it to things.

Battery Life and Charging

Ultimate Ears rates it for up to 14 hours, and testing backs that up: RTINGS measured 13 hours, Tom’s Guide found the figure rang true, and TechRadar routinely got more. That covers a long day at the beach with charge to spare.

Charging is now over USB-C, the change that finally retires the micro-USB port on earlier Wonderbooms. There is no 3.5 mm input or other wired option, so when the battery is flat, the music stops.

Controls, Sound Modes and Stereo Pairing

The Wonderboom 4 doesn’t work with Ultimate Ears’ Boom app, so there is no custom EQ and no way to switch it on from your phone, and with no built-in microphone it can’t take calls either. The only sound control is a button underneath that cycles through the standard mode, Outdoor Boost and Podcast mode.

Outdoor Boost is meant for open spaces: by cutting bass and pushing up the treble it helps music carry outside, and the price is sound quality you would notice at home. Tom’s Guide heard it as little more than extra volume and didn’t think it worth using. The new Podcast mode puts voices forward, but TechRadar found the difference subtle, and Tom’s Guide said it makes it “sound like the hosts are talking to you down a plastic tube.”

Two Wonderboom 4s pair from their own buttons: press once to play the same music on both, press again to split them into left and right channels. A stereo pair is a real step up, with fuller sound in a room and more detail. The speaker can also stay connected to two phones at once, so friends can take turns choosing music.

How Does It Stack Up Against the Competition?

JBL’s Clip 5 is the clip-on rival, Tribit’s StormBox Micro 3 adds an IP68 rating and a longer rated battery, and Bose’s SoundLink Micro (2nd Gen) is the premium palm-sized option.

Ultimate Ears Wonderboom 4: Worth It for Hikes, Beaches and Campsites

Buy it for the trips where a speaker might get wet, sandy or dropped: the pool deck, the beach bag, the tent. It floats, it plays in every direction so nobody has to sit in front of it, and next to the JBL Clip 5, RTINGS found it lasts considerably longer on a charge and sounds less compressed when pushed. Wonderboom 3 owners have little reason to upgrade: Tom’s Guide sees not enough new to justify it, and Tech Advisor calls it non-essential even for Wonderboom 2 owners, though its reviewer would switch just to be rid of micro-USB.

Look elsewhere if you want to fine-tune the sound or take calls: the Clip 5 adds JBL’s app with a custom EQ and a built-in carabiner in a lighter body, and the Tribit StormBox Micro 3 adds a microphone and a 24-hour rated battery. Bose’s SoundLink Micro (2nd Gen) is the premium option: SoundGuys found its sound full and clear, ahead of most ultra-portables it has tested. It sinks rather than floats, though, and SoundGuys measured just over four and a half hours from it at close to top volume. For the smallest size of all, the JBL Go 5 fits a pocket, though RTINGS rated the Wonderboom the better choice for most uses.

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Ultimate Ears Wonderboom 4

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Marcus WebbSenior Editor 𝕏

Marcus has been hunting for the best tech and gear for over 40 years — as a coder, gamer, and lifelong outdoors enthusiast, he knows the gap between a good spec sheet and something that actually holds up.

How this was made: Built from the 17 sources listed above, including 7 independent reviewers such as TechRadar, Tom's Guide and SoundGuys. Written with AI, then fact-checked against those sources by a separate AI. We haven’t tested this product ourselves. How we review →