Four broadcasting ways include emergency broadcasting, microphone, MP3 and external line, each can be turned on and shut off separately.
Electronic recorder can record microphone broadcasting and external line automatically.
Two ways to activate: automatically control and manually control in emergency.
Self-test function and able to activate self-test of other broadcasting devices peripherally.
0.25W monitor speaker applied will monitor broadcasting of above ways.
Automatic switch between normal- and fire- broadcasting.