The Volta Sound Block is a sound amplifier for the iPhone 4 and 5 that incorporates an American Bison horn into its design.  It is made from a block of Northwest Alder wood, and each individual block is hand-crafted.

The Volta Sound Block has no wires, cords, or cables.  It instead uses natural acoustics to enhance the sound of your iPhone. It comes with a travel bag, and the horn is detachable making the device conveniently portable. You can purchase the Volta Sound Block for $190 from Volta Sound.