If the operator is either inattentive or napping, the alertor sounds an alarm.

如操作人员精神或打盹儿，本装置就发声报警。

A device to watch the operator who watches the machine.If the operator is either inattentive or napping, the alertor sounds an alarm.

一种对监工作情况的操作人员进行监的装置。如操作人员精神或打盹儿，本装置就发声报警。