The Ultimate Ears BOOM 4 is a premium portable Bluetooth speaker that is ideally designed for both indoor and outdoor use. It delivers outstanding 360-degree sound with deep bass and a clear midrange, thanks to two full-range speakers and two passive radiators. Its built-in battery provides up to 20 hours of operating time, so frequent charging is not necessary even during long trips or parties. With an IP67 rating, the device is waterproof and dustproof, and it can even withstand up to 30 minutes in water at a depth of 1 meter, while its shock-resistant casing can also withstand being dropped. It works from a distance of up to 45 meters via Bluetooth connection and can be connected to up to 150 compatible speakers thanks to the PartyUp function. The 'Magic Button' on the top makes it easy to control music playback and access preset playlists from various streaming platforms such as Spotify, Apple Music or Amazon Music. MEGABOOM 4 is an excellent choice in all respects for those looking for a durable, stylish and outstanding sounding wireless speaker.