Some of the more interesting uses for an iPhone’s powered headphone port: Fan, (friggen’) laser, flashlight, thermometer, heart monitor, infrared remote, microphone and stethoscope. Oh and Square uses it to accept credit card transactions.
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[youtube=http://www.youtube.com/watch?v=w0VopnVZQ-w&w=630&h=505]
[youtube=http://www.youtube.com/watch?v=adSZdQTk0nI&w=630&h=505]
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