We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Small pink cylindrical Bluetooth speaker with attached fabric loop, matte finish, compact enough to hold in one hand

Logitech

Logitech 984-001878 Ultimate Ears Wonderboom 4 portable speaker pink

SKU CH-V637-R4FYW MPN 984-001878

A pink Bluetooth speaker delivering 360-degree sound with 14-hour battery life, IP67 waterproof and dustproof protection, and a 40-metre wireless range

  • NameULTIMATE EARS WONDERBOOM™ 4 - Pink
  • ColorPink
  • Speaker TypeBluetooth Speaker
  • SpecificationAUDIO Maximum sound level: 86 dBC (normal) and 87dBC (outdoo
  • CompatibilityFor audio playback: smartphones, tablets and other devices t
  • ConnectivityUSB
  • 360° sound from two 40 mm drivers and passive radiators
  • 14 hours playback from rechargeable lithium-ion battery
  • IP67 waterproof, dustproof and floats for 30 minutes at 1 m depth
  • 131 ft wireless range lets you roam freely
  • Podcast Mode boosts vocal clarity for spoken-word content

Pink Bluetooth speaker for outdoor listening

The pink Ultimate Ears Wonderboom 4 is a portable Bluetooth speaker built for people who want music by the pool, at the beach or in the shower. Its IP67 rating means it can be submerged in one metre of water for 30 minutes, resists dust and floats. The attached bungee loop lets you clip it to a bag or hook. It suits anyone needing a rugged, grab-and-go speaker for wet or dusty environments.

Outdoor Boost and Podcast modes shape the sound

A dedicated Outdoor Boost button raises the output to 87 dBC for open spaces, while the new Podcast Mode emphasises vocal clarity for spoken-word content. Pairing two Wonderboom 4 units enables true stereo playback with left and right channel separation. The 14-hour rechargeable battery supports a full day of listening between micro-USB charges. These modes and the pairing option change how the speaker performs in different settings.

86 dBC normal output decides if it fits your space

The speaker delivers a maximum sound level of 86 dBC in normal mode and 87 dBC with Outdoor Boost engaged. That output level is the single figure that tells you whether the Wonderboom 4 is loud enough for your intended use. Buyers who need higher volume for large gatherings or noisy job sites will find this speaker insufficient.

Highlights

  • 360° sound from two 40 mm drivers and passive radiators
  • 14 hours playback from rechargeable lithium-ion battery
  • IP67 waterproof, dustproof and floats for 30 minutes at 1 m depth
  • 131 ft wireless range lets you roam freely
  • Podcast Mode boosts vocal clarity for spoken-word content

Specifications

BrandUltimate Ears
NameULTIMATE EARS WONDERBOOM™ 4 - Pink
Model984-001878
Part Number984-001878
ColorPink
Speaker TypeBluetooth Speaker
SpecificationAUDIO
Maximum sound level: 86 dBC (normal) and 87dBC (outdoor)
Drivers: two 1.57 in (40 mm) active drivers and two 1.81 x 2.57 in (46.1 x 65.2 mm) passive radiators
WIRELESS CAPABILITIES
131 feet (40 meter) range (Actual Bluetooth range will vary depending on the use, setting, environmental conditions and number of connected devices).
Connect up to two source devices at the same time.
Wirelessly play (stream) to 2 WONDERBOOM 4 speakers from one source
CompatibilityFor audio playback: smartphones, tablets and other devices that support Bluetooth [Advanced Audio Distribution Profile (A2DP)]
ConnectivityUSB
Wireless TechnologyBluetooth
Operating Range131 feet (40 meter) range
BatteryRechargeable lithium-ion battery
Playback Time (up to)up to 14 hours of battery life between micro-USB charges
Features14-HOUR BATTERY
BEATS DUST, SPLASHES, AND FLOATS
OUTDOOR & PODCAST MODE
DimensionsHeight: 4.09 in (104 mm)
Width: 0.31 ft (95.3 mm)
WeightWeight: 14.81 oz (420 g) (speaker only)
Package ContentsULTIMATE EARS WONDERBOOM 4
Bungee (attached to product)
Quick Start Guide ( printed inside the box)
Shipping weight0.54 kg
Package size135 × 119 × 109 mm

Other versions of this model

3 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

Will the built-in lithium-ion battery be user-replaceable after it stops holding a charge?

The rechargeable lithium-ion battery is sealed inside the IP67-rated enclosure and is not designed for user replacement.

During all-day playback at the 87 dBC outdoor boost level, does the driver thermal limit or the 14-hour battery run out first?

The rated 14-hour playtime applies to typical use; continuous outdoor boost at the higher 87 dBC output will drain the battery before any thermal limit is reached.

After running continuously for 14 hours, how hot does the enclosure get and does the fan spin louder?

There is no internal fan; the passive radiators and sealed design dissipate heat silently, so the speaker remains barely warm during a full 14-hour session.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.