* 2alarm modes: Siren or pre-recorded voice alarm.
*2emergency 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
*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