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Raise To Speak

iPhone 4S has extra infrared sensor for Siri raise-to-speak

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 screen is activated. The light isn't visible to the human eye but it's there. And it's constantly letting Siri know how close your face is to your iPhone 4S.

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