Patent ID: 7642909

Claim:
Alarm system for providing audio communications between a monitored location and a central monitoring station, comprising: a. a first control unit having a radio transceiver, a speaker connected to a D/A converter, a microphone connected to an A/D converter, and a communicator for communicating with a central monitoring station; b. a second control unit having a radio transceiver, a speaker connected to a D/A converter, a microphone connected to a A/D converter, and a communicator for communicating with a central monitoring station; c. wherein, upon connecting the communicator of one of the first or second control unit to said central monitoring system, the connected first or second control unit functions as a base alarm control unit (BACU) and the non-connected first or second control unit functions as a remote alarm control unit (RACU); d. wherein, said RACU utilizes said A/D converter for converting audio received by said microphone into a first digital signal and transmits via said radio transceiver said first digital signal to said radio transceiver of said BACU; and e. wherein, said BACU transmits via said radio transceiver a second digital signal, and said RACU receives said second digital signal with said radio transceiver of said RACU and said RACU utilizes said D/A converter for converting said second digital signal into an analog audio signal which is converted by said speaker into audible sound.