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Small blue cylindrical speaker with fabric wrap and carrying loop

Ultimate Ears Wonderboom 4 984-001877 Blue Balanced 360-Degree Sound Dustproof Floating portable speaker

SKU CH-R6PW-JT0KQ

A waterproof, dustproof and floating Bluetooth speaker delivering 360-degree sound with 14-hour battery life and 40-metre range

  • Product nameWonderboom 4
  • Connection optionsBluetooth
  • Speaker categoryOutdoor
  • Input sourcesBluetooth
  • Operating distance40 m
  • Speaker setup2.0
  • 360-degree sound fills every direction with balanced audio
  • Up to 14 hours of playtime keeps the music going all day
  • IP67 rating survives submersion in 1 metre of water for 30 minutes and blocks dust
  • 40-metre Bluetooth range lets you roam freely without dropouts
  • Pair two speakers for true stereo separation with left and right channels

Compact 360-Degree Outdoor Speaker

The Ultimate Ears Wonderboom 4 is a portable Bluetooth speaker built for outdoor use. It delivers balanced 360-degree sound from a 2.0 active configuration with a 75 hertz response bandwidth. The IP67 rating means it survives immersion in one metre of water for 30 minutes and resists dust completely. It also floats and includes a handy carrying loop.

Upgrade From Mono Or Indoor-Only Units

This speaker replaces single-driver portables that lack stereo separation or environmental protection. The jump is worth it when you need true wireless stereo pairing, an outdoor EQ boost, and a dedicated podcast mode for clearer vocals. Battery life reaches 14 hours, and wireless range extends to 40 metres or 131 feet. Drop tested to 1.5 metres.

Check Bluetooth Source And Charging Cable

Verify your phone or tablet supports Bluetooth pairing; Google Fast Pair works on Android 6.0 and above. A USB-C cable is required for charging and is not included in the box. Confirm the 4.0 by 4.0 by 8.0 inch dimensions fit your bag or mount. The speaker uses a minimum of 31 percent post-consumer recycled plastic by weight.

How it compares

Measured against everything we stock in Bluetooth & Party Speakers, at today’s prices. Recalculated every night.

Price $58.99
Pricier than about 68% of the 862 comparable items (median $39.99).

Specifications

Product
Brand nameUltimate Ears
Model name984-001877
Part number984-001877
Product nameWonderboom 4
Product colorBlue
Audio & video
Speaker categoryOutdoor
Speaker setup2.0
AmplificationActive
Frequency response75 Hz
Connectivity
Connection optionsBluetooth
Operating distance40 m
Ports & slots
Input sourcesBluetooth
Size & build
Product dimensions4.0 in × 4.0 in × 8.0 in
In the box
In the boxWonderboom 4 Blue

Questions about this item

What are the exact dimensions of the Wonderboom 4 so I can check if it fits my bag or cup holder?

The speaker measures 4.0 in x 4.0 in x 8.0 in, making it compact enough for most cup holders and small bags.

How do I pair two Wonderboom 4 speakers for true stereo sound, and what is the common mistake?

Press the pairing button once to link them for louder mono sound, then press it a second time to activate left and right stereo channels; the mistake is stopping after the first press.

When will the rechargeable battery need replacement, and how is it charged?

The built-in battery delivers up to 14 hours of playtime per charge and is replenished via a USB-C cable; the battery is not user-replaceable.

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