preset device

基本解释

In this way, the culture fluid output device can output preset amount of culture fluid stably each time and is convenient to be filled with culture fluid.
藉此，本实用新型即可达到每次都较为稳定地输出固定量的培养液，且较为方便进行培养液的盛装工作。
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Photo-electric counter installed for total or preset counting and kicker device. Back delivery machine can adjust conveyor with the demand for the vertical and horizontal.
采用光电计数，可行总数或定量计数，配置踢板记号识别装置，后收取输送机，可随需求调整为直式或横式两用，便于包装。
Plugging a portable audio device into the aux-in jack automatically sets the volume at a preset level; when the device is unplugged, the volume resets to its previous level.
插入的辅助便携式音频设备的接口，自动设置在预设的水平音量，当该设备被拔掉，体积重置到先前的水平。

Traditional security does this with a separate device, usually a card or a dongle, that is preset at the home office.
FORBES: Google's Random Security