Enjoy powerful 360° big bass and balanced sound with the UE Ultimate Ears Boom 4. Outdoor Boost makes music clear in noisy environments, and the BOOM app (download required) adds EQ presets and lets you access playlists even when the speaker is off. IP67-rated, floatable and dustproof for outdoor use, with up to 15 hours of battery life and USB-C charging. Compatible with BOOM, MEGABOOM, EPICBOOM and HYPERBOOM for expanded sound.