Like the iPhone 4 the 3.5 inch 960 by 640 pixel Retina display supports multitouch, a technology that allows multiple simultaneous touch
inputs. Siri, a voice control feature exclusive to the iPhone 4S, interprets
voice commands and can give visual and auditory feedback. The iPhone 4S
has two volume buttons and a ring/silent switch on the left side.
On the top left there is a 3.5 mm headphone jack and the lock/power button is
situated on the top right edge of the device. The right side of the device
is devoid of inputs except for a SIM card slot. The bottom of the device
features a speaker output on the right and a microphone input on the left with
Apple's proprietary 30-pin dock connector in the center. The top left on
the back of the device houses an 8 megapixel f/2.4 aperture camera with an LED flash.
The iPhone 4S supports video out via AirPlay and various Apple A/V
cables. Supported video formats include such as H.264 (1080p 30 fps max.),
MPEG-4 video, and motion JPEG (M-JPEG).
In addition to user inputs, the device also has several sensors
that give the phone information about its orientation and external conditions.
These include a 3-axis gyro, an accelerometer, a proximity sensor, and an ambient
light sensor.
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