Add more bass to your music with the Sodapop Portable Expandable Bass Speaker. Featuring a Scandinavian design, this device increases the lowest frequencies by 10 decibels when you connect it to a regular bottle. Likewise, the human ear perceives this as twice as much bass. To experience large sound, connect the bottle-shaped protective carrying case. Alternatively, you can use a regular empty bottle with the same thread size. The portable speaker also works with most regular bottles from all over the world, making it an ideal traveling companion. In addition, the Sodapop speaker provides up to 30 hours of music on a single charge. Available in multiple colors, the compact speaker delivers impressive sound and looks great while doing it.