If you have been wondering how
Siri reacts so quickly when you “raise to speak”, the answer is a tiny infrared LED that’s added into the proximity sensor in the
iPhone 4S.
iFixIt discovered the sensor after a second look, determining that it shines brightly whenever the...


Source: http://feedproxy.google.com/~r/TheIphoneBlog/~3/52UpVgKrbJw/story01.htm
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