There's no need to plug in the MegaPhone or charge batteries. Just set your iPhone at the tip of the horn and let the natural acoustics of the creation take over.
The MegaPhone is made of ceramic with an elegant wood base. It is available in white, black, or gold to match your iPhone color or Donald Trump decor. It costs about $550 for white or black and $820 for the gold-plated version.
When not in use as an iPhone amplifier, the MegaPhone could double as a Thanksgiving cornucopia centerpiece or as a replacement horn for your gramophone. What, you don't own a gramophone? All the cool kids have gramophones.
Even if you don't pick up a MegaPhone for yourself, consider getting one for your great-grandmother, if she's still around. It should bring back some fond memories of the good old days before amplifiers had to be plugged in.