Two signal handlers are connected — one to quit the application when the user closes the window and another to change the greeting that is displayed when the user clicks the button.

两个信号处理器被连接起来——一个用来在用户关闭窗口时退出应用程序，另一个用来在用户点击按钮时，修改显示的欢迎信息。

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It's a simple device that contains a pressure-sensitive button that sends a signal when it is pressed or released.

这个简单的设备包含了一个压力感知按钮，当我们按下或者释放该按钮时它会发送一个信号。

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When you're done speaking, you have to press the button yet again to signal the end of the query (tap).

当你说完后，你需要再次按一下按钮，表明语音输入已结束（又一下）。

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Another possible draw: the introduction of a service called Sea Smart, a one-button emergency gizmo, comparable to OnStar for luxury autos, with a panic button that sends a signal via satellite every ten seconds and offers real-time tracking of the distressed vessel on a 3-D color map back at Sea Tow's headquarters.

FORBES: Magazine Article

The insole does this by communicating with a "base station, " an intermediary device between the button in the shoe and the television set, which uses a radio signal to calculate and transmit the information.

CNN: Device keeps TV watching on track

The device "learns" the infrared signal from the TV remote and switches off the entire bank of plugs when the standby button on the remote is pressed.

WSJ: Switching Off Standby Mode