This device certainly has a retro look. It looks like the horn on an old Gramophone or perhaps great-grand-dad's ear trumpet. If the sound on your iPhone appears to be a bit weak, this might be the device for you. Or for great-grand-dad.
The eco-amp is an iPhone amplifier made from recycled paper, containing no battery or electronics, providing an environmentally friendly approach to portable amplification.
The eco-amp is available for US$7.99 plus shipping, with each package containing two units. For more information on assembly, check out this instructional video from eco-made:
I think the eco-amp looks a lot like these devices:
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