[Chekov makes a face at Howl.] Not all of us can rely on magic.

Radios are antiquated--in my time, antiquated, I mean no offense--machines that transmit information using continuous sine waves. There is a receiver, a transmitter... there is not much to it. [He pauses. If Sophie doesn't know anything about radios...] Radios... ah, make it so that sounds in one place may be heard in another distant place.