It was not long ago that inventors were borrowing inspiration from science fiction for the mobile phone. It soon became "smarter", then touch screens were followed by countless more smart devices.
But how smart can a watch actually be?
BBC Click’s Marc Cieslak discovers how far time has come since the clock tower containing Big Ben was built, and looks at devices that do more than just tell the time – incorporating personal locator beacons, phones and music players.
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