The latest experimental utility from Google Research's kitty is Google Tone. The Chrome extension enables users to broadcast and share URLs over audio signals. Google Tone uses your computer's microphone and speakers to exchange URLs with nearby computers connected to the Internet. Any computer, phone or Hangout conversation within earshot that also has the Google Tone extension installed and turned ON can receive a Google Tone notification making sharing url's effortless.

How Google Tone Works?

Tone works on a mechanism that is very much similar to human voice. This Google extension is very aptly named Tone as it has many attributes matching the human voice. For instance, it cannot pass through walls like radio frequencies or require an address or pairing to reach to the receiver. The click of a button produces a chirruping sound from your computer speakers, and this is what sends the URL to other devices that are in the sound hearing range. The chirruping sound is both a dual tone audio (DTMF) and ultra-sonic signal. This has been specially engineered to work reliably even at low volumes in short distances for many different types of audio environment.