Gadgets : Horn Stand for iPhone: 
Adds 13 decibels to the volume of your iPhone, no power necessary! Slide the Horn Stand on to your iPhone 4/4S and enjoy an additional 13 decibels of sound pressure. It requires no power from your phone's battery! The Bone Horn Stand is good, wholesome, old-fashioned acoustical science. $9.99
Adds 13 decibels to the volume of your iPhone, no power necessary! Slide the Horn Stand on to your iPhone 4/4S and enjoy an additional 13 decibels of sound pressure. It requires no power from your phone's battery! The Bone Horn Stand is good, wholesome, old-fashioned acoustical science. $9.99
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