According to Clarke's Third Law: " Any sufficiently advanced technology is indistinguishable from magic." Air Curve Play is based on some very advanced technology, indeed; & when you hear it, you will agree it is magical. Air Curve Play makes the speaker of your iPhone 10 decibels louder... no, really. & it works without batteries or cables or power adapters or incantations. Just slip your iPhone into Air Curve's rubber dock gasket, & your iPhone 4 becomes the perfectly portable audio/video conference phone, & self-contained music player & video viewer. Without revealing the secret of the magic, we can tell you that Air Curve is a cleverly designed acoustic amplifier that collects the sound from the built-in speaker of your iPhone, amplifies it in a built-in coiled waveguide, & projects it out into the room. Air Curve's transparent polycarbonate body lets you appreciate the waveguide's graceful curves, inside, that do all the work. That's some great-sounding mojo. Features * Acoustically amplifies the speaker of your iPhone without batteries, cables or electricity; internal engineered waveguide requires no power * The perfect solution for audio & video conferencing with iPhone 4 * Listen to audio from videos, games, & music without headphones * Holds your iPhone in both landscape & portrait mode * Insert your own dock cable to use as a charge/sync dock