Bamboo Music amplifier for your smartphone ? Just place phone, and instantly enjoy enhanced sound ? Made from Eco-friendly, 100% natural bamboo ? Each speaker is unique and different as it is made from unprocessed material ? No bluetooth or power source needed ? Anti-tilting inclined stand ? Handmade sound amplifier works through passive sound amplification ? Great for hands-free calls and skype ? Comes in PU gloss finish for high durability Note: Since it is made of natural bamboo, product is subject to minor variations in size