Automatic unattended equipment, equipment, process without human intervention.

全自动无人值守设备，设备进程无需人工干预。

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We recommend that you switch off the power supply when leaving electronic equipment unattended for a longer period.

如果电子设备长期处于无人照管的状态下，我们建议把电源关闭。

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Rapid expansion in the use of private automatic branch exchanges. Development of remote alarm equipment for unattended exchanges.

用户自动交换机迅速普及。开发无人交换机远端报警设备。

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