Light switches in the plant room are all timer switches.

位于机房内的全部灯光开关器都装设了时间掣。

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The working principle and the functions of the monostability multivibrator composed of 555 timer are introduced in the paper, and the time switches are designed.

介绍了用555定时器构成的单稳态触发器的工作原理，对其功能作了进一步探讨，在此基础上设计了一种具有实用价值的定时-非定时两用开关。

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They also found two kitchen timer units, two toggle switches attached to the timers in a plastic lunch-type box and a vehicle battery in the front passenger foot well.

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