Our line of hand-crafted, sustainable, German Design Award-winning smartphone speakers work with any smartphone, are made entirely out of high-quality birchwood, and don't need electricity or special connections.  The specially engineered inner sound tunnel and rings increase music volume by 25 dB - a perceived increase of %400.   The unique acoustical properties of birchwood deliver a warmer tone, smoother highs, and more prominent bass.  Your speaker will come with a screen-printed cloth package.