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

如员精神不集中或打盹儿，本装置就会发声报警。

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

监视机器情况的员进行监视的装置。如员精神不集中或打盹儿，本装置就会发声报警。