Ultimate Ears Wonder-Boom 4 Portable Bluetooth Speaker

The Ultimate Ears WONDERBOOM 4 is a compact, high-performance portable Bluetooth speaker engineered for everyday listening and rugged outdoor use. With an IP67-rated design and advanced audio features, it delivers immersive 360° sound, extended playtime, and robust connectivity — ideal for active lifestyles, travel, and social gatherings.

Immersive 360° Audio Performance

The Wonderboom 4 features a true 360-degree sound profile that disperses audio evenly in all directions, ensuring consistent volume and clarity regardless of listening orientation. Dual full-range drivers and passive radiators are tuned to balance mids and lows, producing rich, bass-enhanced sound in a compact form factor.
Outdoor Boost mode intelligently optimizes frequency response for open spaces, while Podcast Mode enhances vocal clarity — perfect for spoken-word content in noisy environments.

Reliable Wireless Connectivity

Equipped with Bluetooth technology and support for standard audio profiles like A2DP, the speaker maintains a wireless connection up to ~40 m (131 ft) from compatible smartphones, tablets, and other Bluetooth-enabled devices. Pairing is quick and stable, with support for connecting two source devices for flexible playback control.

Expandable Stereo & True Wireless Pairing

For enhanced audio output, two WONDERBOOM 4 units can be wirelessly linked: press once to double overall volume and again for true stereo sound with distinct left and right channels. This scalability makes it suitable for larger spaces and group listening scenarios.

All-Day Battery Life

The built-in rechargeable lithium-ion battery delivers up to 14 hours of continuous playback on a full charge, supporting extended listening without frequent recharging. Typical usage includes music, podcasts, and streaming audio throughout the day.

Rugged, Outdoor-Tough Construction

Designed to withstand environmental challenges, the WONDERBOOM 4 carries an IP67 rating, making it waterproof, dustproof, and floatable — capable of surviving immersion up to 1 m deep for short durations. Its drop-resistant and dirt-resistant housing ensures durability on trails, beaches, and poolside outings, while the integrated carry loop adds portability.