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

如操精神不集中或打盹儿，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.

一种对监视机器工操进行监视装置。如操精神不集中或打盹儿，本装置就发声报警。