From Enandis.com:

Passive Amplifier for iphone made of ceramic. the form is designed to amplify and optimize the best sound output. the amplifier is based on a thin wooden frame that allows the object to float off the table. this in order to increase the vibration of the object and to optimize the emission of sound. designed for the iPhone is perfect for listening music without headphones, for audio conference to hear the person on the phone as live voice.

Ohhhhh pretty. The only problem with the Megaphone is its price: Since the thing is hand made, it could cost you from $540 to $800 depending on the model you choose.

[Source: En&Is | Via Laughing Squid]