The component itself can output a signal to stop the power.

组件本身可以输出一个信号，停止电源。

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Getting a DNT signal does not oblige anyone to stop tracking, although some companies have promised to do so.

获得 DNT 信号并不意味着任何人都必须停止跟踪，尽管一些公司已经承诺会这样做。

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With the right device tuned to the right frequency, what's to stop a thief from jamming your setup and blocking that alert signal from ever reaching the base station?

通过将正确的设备调整到正确的频率，如何防止小偷干扰你的设备阻止警报信号到达基站呢？

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Because tunnels block a radar signal, trains rely largely on hard-wired equipment like the box beside the track, which helps drivers and dispatchers talk to each other and controls a machinelike traffic signal, giving the drivers basic commands to stop and go.

NEWYORKER: Boss Rail

Engineers used plastic dams in a bid to stop water getting into signal boxes at Cowley Bridge, Devon.

BBC: South West rail problems could last five days

That would stop the radio signal needed to take money off your bankcard.

BBC: London bus contactless system charging wrong cards