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Warning Devices | 警告设备

Device which sends an alarm message acoustically (siren) or optically (strobe light). Diallers are also warning devices as they inform the user of a alert on the system.

通过声学（警笛）或光学（闪光灯）发送报警信息的装置。拨号器也是警告设备，因为它也通知用户系统上的警报。


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