Alarm Signalling Devices
All alarm systems require some method of indicating that an alarm has occurred. The most common signalling device is the external sounder, usually with an integral strobe light. Other signalling devices might include speech diallers, GSM modules, internal sounders and communicators for connection to a central monitoring station.
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 | External Sounders |
 | Internal Sounders |
 | Speech and Text Diallers |
 | Communicators |
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