Samsung Galaxy S4
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Eye-tracking Samsung Galaxy S4 unveiled

Samsung has launched a smartphone which allows users to control its 5in (12.5cm) screen using only their eyes.

The Galaxy S4 follows on from last year's S3, a product that sold over 40 million units worldwide.

The device was unveiled at a lavish, Broadway-themed event in New York.

Technology analyst Carolina Milanesi, from Gartner, said the key to its success would be whether its novel features would be of use on a daily basis.

Michelle Fleury reports from New York.

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