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. This Color bundle includes 4 of the best selling colors: Salt Turquoise, Kink Pink, BizViz Blue, and Yolk Yellow. Each speaker comes with a screen-printed cloth package that looks beautiful on display, and hand-signed certificates of authenticity by designer and maker Erbil Sivaslioglu. With your first order, you gain access to the Bitti Gitti Partners area with extra visuals, photos, and templates for your online store and social media content.