While each box contains a beacon, the unit only has enough battery power to transmit a signal for 30 days.

虽然每个盒子里都有一个信标，但这个装置的电池只能够传输30天信号。

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The electricity thus generated is sufficient to send an OK signal to the central control unit.

如此，产生的电力足够向控制中心发送一个“没问题”的信号。

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I installed a USB port on it and bought a Linksys unit to connect to my roommate's wireless signal.

我给电脑添加了USB端口和一个Linksys的模块来连接我室友的无线信号。

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Now this is a rain gauge, and it's sitting on a roof of a building, and when the water falls into this gauge, it sends a signal to the logic unit of the computer, which immediately notifies the memory bank of the computer to seek out its instructions for a rainy day.

这是一个雨量测量器，安装在一个楼房的,屋顶上，当水流入到这个测量器，它就给计算机的逻辑部件发送一个信号，计算机立即通知内存条,为下雨天找出相应的指令。

哈佛公开课 - 计算机科学课程节选

The unit receives a video signal from analog cable or a broadcast antenna and rescales the image to be compatible with high-resolution monitors.

FORBES: ViewSonic's Viewbox Converter Goes To College

He talks up the importance of a strong unit of account, but refuses to engage in any actions that would signal to the markets he's serious.

FORBES

This, in the end, may be the reason Google is letting go (and could also signal that Cisco will soon sell its own TV set top box unit) as Asian competitors may be turning set top boxes into commodities.

FORBES: Selling Motorola's TV Group: a Strategic Mistake for Google?