Shop BOOM 4 Speaker. Features balanced 360° sound, deep bass, one-touch music control, water, dust & drop proof, and stunning high-performance fabric. The BOOM 4 portable waterproof Bluetooth speaker delivers rich, 360-degree sound and deep, accurate bass, all carefully balanced so you can hear every note. This waterproof portable speaker has a rechargeable battery that stays powered, pumping tunes for 15 hours on a single charge. Rated IPX7 waterproof and drop-proof up to 1.5 metres (15 feet), the BOOM 4 floating Bluetooth speaker is virtually indestructible. Use PartyUp on the Ultimate Ears BOOM app to pair several portable Bluetooth speakers, creating the ultimate surround sound experience. Play, pause, skip, and control music directly from your favourite streaming service; set up one-touch playlists on platforms like Spotify, Amazon Music on Android, or Apple Music on iOS.