It should be simple for multiple people to control and stream music through a single sound system. But too often, it’s not. Some speakers support AirPlay, but Apple’s walled garden rules out Android hardware. Bluetooth is an adequate solution,_but all too frequently your playlist is interrupted by an incoming text message, or when you step outside and suddenly notice your smartphone is out of range. Gramofon is a cheap, small and stylish Wi-Fi router from Fon that turns any speaker into a music streaming jukebox. To get started, you’ll need to plug the box into a power supply and then...

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