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There are impedance speaker and high-voltage speaker.
Impedance speaker is used for Paging Intercom System;
high-voltage speaker is used for Public Address System and Emergency Communications System, Approved by Chinese Fire Protection Safety Center (CFS).
Self-amplified Speaker (SAMP Speaker)
Built-in amplifier: Could be connected with audio directly or touched off by external contact.
Sounder (with recording function)
You can record the message in advance; the message will be broadcast when the external contact is touched off.