The exploded view of the home button which doubles as a fingerprint 

The exploded view of the home button which doubles as a fingerprint sensor is seen on an image of the new iPhone 5S at Apple Inc's media event in Cupertino
Reuters
The exploded view of the home button which doubles as a fingerprint sensor is seen on an image of the new iPhone 5S at Apple Inc's media event in Cupertino, California September 10, 2013. REUTERS/Stephen Lam
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