The 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 4 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.