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.

It does raise a few questions, though. IR is fairly light on battery drain but every little bit extra does add up. Also, iPhone 4 and other older models lack the extra IR sensor, making it seem even more unlikely Apple will ever offer an official port.

If you're interested in seeing how it works you can check out iFixIt's video via the link below.

Source: iFixIt

Allyson Kazmucha

Help and how to editor for iMore. I can take apart an iPhone in less than 6 minutes. I also like coffee and Harry Potter more than anyone really should.

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There are 11 comments. Add yours.

fastlane says:

(Homer Simpson voice) Mmmmmm... iFixit girl...

Skdjhfoshfsdfh says:

id stuff her to the gills for sure. her boobs look nice, Id like to see more!

cpagan2000 says:

possible this could be the battery drain huh?

Angelina Christopher says:

Great for me......!!! nothing to worry about where is it how its gonna respond.....!!!!http://www.1socialmediaagency.com/

patti carbonell says:

Have a look to our blog talking about Iphone 4S Siri-ously
One of the most exciting things about the iPhone 4S for ditto’s Tech Lab, is the new Siri assistant. It is truly revolutionary and will change the way in which we use smartphones, mobile devices, and possibly even computers forever. A bold statement, but Siri deserves it...http://www.ditto.tv/blog/2011/11/ditto-is-speaking-siri-ously/