Chromecast built-in is a technology that allows you to wirelessly stream your music from your phone, tablet or laptop to your Bose smart speaker or smart soundbar. It’s easy to use. Within a cast-enabled music streaming service, like Spotify, select the Chromecast icon while you’re listening to music to send or cast your music to your Bose smart speaker or soundbar. You can only cast audio to your smart speakers, not video content.