The iPhone's headphones are similar to those of most current smartphones, incorporating a microphone. A multipurpose button in the microphone can be used to play or pause music, skip tracks, and answer or end phone calls without touching the iPhone. The 3.5 mm TRS connector for the headphones is located on the top left corner. The headphone socket on the original iPhone is recessed into the casing. The recess is narrow when compared to many headphone jacks, making them incompatible without the use of an adapter.The iPhone 3G has a flush mounted headphone socket.
Wireless earpieces that use Bluetooth technology to communicate with the iPhone are sold separately. It does not support stereo audio.
The loudspeaker is used both for handsfree operations and media playback, but does not support voice recording.
Composite or component video at up to 576i and stereo audio can be output from the dock connector using an adapter sold by Apple.
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