The Ultimate Ears Boom 4 Portable Waterproof Bluetooth Speaker delivers a balanced 360-degree sound with clear audio and bass, making it suitable for outdoor gatherings, poolside listening, or casual indoor use. Its cylindrical design is constructed from durable, water-resistant materials with a robust outer mesh and rubberized end caps, ensuring reliable protection against impacts and moisture. The speaker carries an IP67 waterproof rating, allowing it to be submerged in up to one meter of water for 30 minutes, and it also floats, providing added security near water environments. Equipped with a rechargeable battery that offers up to 15 hours of continuous playback, the Boom 4 maintains stable performance across a wireless range of 147 feet (45 meters) via Bluetooth 5.3, ensuring consistent connectivity without frequent dropouts. The audio output is engineered to produce well-defined mids and highs alongside a punchy low end, achieved through a dual passive radiator system that enhances bass response without distortion at moderate volumes. The control interface is straightforward, with oversized buttons for volume, playback, and pairing, allowing easy operation even with wet hands. The speaker’s compact and lightweight form factor makes it portable, fitting easily into backpacks or cup holders. The price point of $15.81 represents an exceptionally affordable option compared to comparable portable speakers on the market, offering substantial value for a device that combines durability, functional performance, and long battery life. The blue color variant adds a vibrant aesthetic without compromising the rugged build quality.

The Boom 4 provides a practical audio solution for users seeking a reliable, water-resistant speaker that delivers consistent sound output in varied environments. Its straightforward design focuses on core functionality, avoiding unnecessary complexities while maintaining a high level of user satisfaction in terms of build integrity and sound clarity. The speaker is ideal for outdoor enthusiasts, casual listeners, or anyone looking for an everyday portable audio device that performs well in damp or dusty conditions.