Chromecast Audio
Until the launch of this silver-dollar-size widget, you had to spend hundreds of bucks to wirelessly link all your home’s speakers to one audio source—and you were stuck with one brand of speaker. Now, with Chromecast, you can link any speaker you want—be it a portable backyard unit or an old-school hi-fi setup—through wi-fi and use the Chromecast app to stream from any source you want, from Spotify to Pandora to your iTunes library. $35, store.google.com
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