How does guest mode work?
When guest mode is turned on, Chromecast emits a special WiFi beacon. When a Chromecast-enabled app is launched on your guest's mobile device, that device detects the
presence of the special Wi-Fi beacon and shows the Cast icon 
Your Chromecast then generates a random 4-digit PIN that is required
to cast to it using guest mode. When a device nearby tries to connect,
the Chromecast automatically transfers that PIN using short, inaudible
audio tones. If the audio tone pairing fails, your guest will be given
the option to connect manually by entering the 4-digit PIN found on your Chromecast backdrop and in the Google Home app.
Learn more about the guest mode PIN.
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How does guest mode work?
When guest mode is turned on, Chromecast emits a special WiFi beacon. When a Chromecast-enabled app is launched on your guest's mobile device, that device detects the presence of the special Wi-Fi beacon and shows the Cast icon in the application. ...How does guest mode work?
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