Sentence:  She held it out toward him. It was the size of a chicken egg, only broken in half. The other half of the crystal—carried by another—would vibrate in tune with its twin, allowing communication, like a walkie-talkie. “A <WSD>farspeaker</WSD>! Pindor gasped out. "Why didn't you tell us you had one!" "I did. Back when I first ran into you all," she reminded them. "I had been calling Papa on my <WSD>farspeaker</WSD> when I was snatched here." 
Meaning of the word marked with <WSD> tags:  A device or apparatus used to farspeak or communicate over long distances; telephone.