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PLUG_IN_REMOTE_TELEPHONE_RINGER

2014-11-11 21:16  
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PLUG_IN_REMOTE_TELEPHONE_RINGER
This device consists of a ring detector connected to the telephone line. When the telephone rings, the ring detector impresses high-frequency pulses on the ac power line.A receiver placed anywhere on the same power line detects these pulses and emits an audible tone in synchronization with the telephone signal.