We are manufacturer, professional public address system 1, Emergency 2, Automatically it . 3, as come true conference 4,Talk

 1.It was maked changed automatic, opening the system automatic also.

 2.Come truth it's the broadcasting , operating within the language Notice.

 3.When talking together, as for telephone conference.

 4.Power off automatic remembered the old worked function.

We are manufacturer, professional  public address system

1.Emergency

2.Automatically it.

3.As come true conference.

4.Talking by phone each other.

Public address system Telephone controller