The fighting starts when a signal such as an air horn or whistle blows, and can last anywhere from a few minutes to a few hours.
当用号角或口哨发出信号时，大战就可以开始了，在任何位置都行，能持续几分钟到几个小时。
2
By single chip computer control of counter automatically generate tong 1 second stop 4 seconds of signal, make no. 5 relay output drive electric horn turns electrify.
由单片计算机控制的计数器自动产生通1秒停4秒的信号，使5路继电器输出带动电喇叭轮流通电。
3
We use this air horn to give a signal in the event of emergency.