According to time or radiant exposure setting countdown timer, Arrow keys facilitate displayed program function and characteristics.
根据时间或辐射曝晒设置的倒数计时器；箭头键便于滚动显示程序功能与特征。
To FPGA development platform for the traffic signal system, with a countdown and the buzzer function.
以FPGA为开发平台的交通信号系统，带有倒计时和蜂鸣器功能。
The prototype has a countdown, and power failure alarm function. It produces oxygen stable with low noise, consistents with relevant national product standards.
该样机具有倒计时，断电报警等人性化功能，产氧稳定，噪音低，符合国家相关产品标准。
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