September 10, BBC News

Apple has unveiled the latest version of its iPod Nano, featuring what it says are the thinnest measurements yet.

The fourth generation Nano was launched at a US press conference by Apple chief Steve Jobs, who announced new shuffle and library features.

He also listed the Nano's environmental credentials, including arsenic-free glass and a mercury and PVC-free body that is "highly recyclable".

The Nanos are expected to sell in the UK for £109 ($191) for the 8GB version.

The 16GB version will retail at £149.

Speaking live in San Francisco, Mr Jobs unveiled Apple's new Genius function which allows users to create automatic playlists from the iPod's library with the click of a button.

He said the function worked by taking one song and creating a playlist based on the user's song library and could also suggest other tracks the user might want to buy.

Apple chief Steve Jobs unveils the new iPod Nano
Mr Jobs described the new Nano as "highly recyclable"

Mr Jobs said the new Nano also had a "shake to shuffle" mode, which sends the gadget to shuffle mode with the flick of a wrist allowing you to go backwards and forwards on your playlist.

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photo: Mr Jobs described the new Nano as "highly recyclable" (Getty Images)