Guest mode is one of the Chromecast's relatively unknown but very handy features. It uses location proximity and WiFi availability to allow guests to cast content to your speakers or TVs without logging in to your WiFi network, provided they have the specific PIN code for that device. Whether you're throwing a party or have temporary visitors and you don't want to bother with sharing WiFi access, you can simply give them a 4-digit code and let them choose the media that gets played. The feature launched in December of 2014 on Chromecasts and carried over to Google Homes — because they're essentially cast targets.

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