*Standard cabinet design (1U).
* 2 alarm modes: Siren or pre-recorded voice alarm.
*2 emergency alarm modes are optional: stop the alarm immediately when the alarm short-circuit trigger is cancelled; after the alarm short-circuit trigger is cancelled, the alarm sound will play circularly (you need to manually press the stop key to cancel the alarm).
*3 alarm audio storage modes: 1 microphone recording input circuit; 1 recording input circuit; in addition, there is built-in alarm audio.
* Built-in recorder which can record 2 ~3 minutes voice message.
