The Ultimate Ears MEGABOOM 4 Portable Waterproof Bluetooth Speaker is the ultimate Bluetooth party speaker, delivering powerful 360-degree sound and thundering bass without sacrificing balance and clarity. With a massive 20 hours of sound on a single charge, you can boom all day long. With a wireless range of 147 feet (45 meters) and drop protection of up to 3.28 feet (1 meter), it's safe to say the MEGABOOM 4 wireless speaker is made to move.