First look at Amazon's new Echo speakers
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Amazon Echo smart speaker family expands

Amazon has revamped its main Echo smart speaker for the first time since its launch in 2014 and unveiled a range of associated devices.

The artificial intelligence-enhanced speaker helped establish a new product category and - although sales figures are not released - is thought to have outsold Google's rival Home by a wide margin.

The BBC's North America technology reporter Dave Lee went to the launch event in Seattle.

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