The idea for this app grew out of a previous product that Square developed in 2009, which allows cell phone users to connect a credit card scanner to their headphone jacks.
2
我们当然知道既然我们能用它来打电话，那么音频一定从耳机接口进入了手机。
Of course we know that audio is getting into the phone from the headphone jack, since we can use it to place calls.
3
我们最近听说三星 Galaxy S Android 手机国际版可以通过耳机接口发送视频信号。
We've recently learned that the international version of the Samsung Galaxy S Android phone can send video signals through the headphone jack.
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