WONDERBOOM 4 Gray Portable Waterproof Bluetooth Speaker - Big Bass

In this review the WONDERBOOM 4 Gray is evaluated as a compact, go-anywhere Bluetooth speaker best suited for people who want bold, room-filling sound from a rugged, travel-friendly package. The single biggest reason to buy is its combination of surprisingly bigger 360-degree sound and a long single-charge runtime that lasts through a day of outdoor activities; the reviewer found it punches well above its size with clear mids, boosted bass, and a simple interface for fast setup.

Key Features

• 360-Degree Sound: Delivers even coverage so a small speaker can fill a room or a backyard without having to be aimed toward listeners.
• Outdoor Boost: A one-touch Outdoor Boost increases loudness and presence for open-air listening where sound disperses quickly.
• Podcast Mode: Enhances vocal clarity so spoken-word content sounds richer and easier to follow on walks or at the campsite.
• 14 Hours Playtime: Battery life that reliably lasts through a full day of use, reducing the need to recharge during outings.
• IP67 Waterproof/Dustproof: Can be submerged and will resist dust, making it suitable for poolside, beach, or shower use.
• Floatable and Durable: Floats in water, is drop-tested from roughly 5 ft, and uses recycled plastic in its construction for added durability and sustainability.

Who It's For

This speaker is ideal for outdoor enthusiasts and casual listeners who need a small, rugged Bluetooth speaker that still delivers strong bass and clear vocals. Its floatable IP67 build and long range make it a practical companion for pool parties, beach days, backyard barbecues, and showers.

Those who prioritize audiophile-level fidelity or very high maximum volume for very large gatherings may want to consider larger powered speakers; likewise, people who need integrated voice assistants or advanced streaming apps built into the speaker should look elsewhere.

Pros & Cons

Pros

• Compact size with unexpectedly robust bass and wide 360-degree dispersion.
• Multiple listening modes including Outdoor Boost and Podcast Mode for tailored sound profiles.
• Waterproof, dustproof, floatable design that holds up to outdoor use and accidental drops.
• Simple pairing and good wireless range up to 131 ft for freedom to move while streaming music.

Cons

• Small enclosure means true maximum loudness and low-frequency extension are limited compared with larger speakers.

Specifications

Brand	Ultimate Ears
Model	WONDERBOOM 4 (Gray)
Playtime	Up to 14 hours
Wireless Range	131 ft (40 m)
Ingress Rating	IP67 (waterproof, dustproof, floats)
Pairing	Double Up for stereo pairing of two speakers
Materials	Includes minimum 31% post-consumer recycled plastic

Our Verdict

The WONDERBOOM 4 Gray is a strong choice for anyone who wants a rugged, portable Bluetooth speaker that actually sounds bigger than it looks. With useful sound modes, long battery life, and waterproof floatable construction, it represents good value for frequent outdoor or travel use, though buyers seeking very large-room volume should consider a larger speaker.

Frequently Asked Questions

Does it float?
Yes. The speaker is floatable and rated IP67, so it can be used safely at the pool.

How long does the battery last?
Battery life is up to 14 hours on a single charge depending on volume and playback content.

Can two units be used for stereo?
Yes. Two WONDERBOOM 4 units can be paired to provide true left and right stereo playback.