Message Waiting Light,Residential, IP, PBX & Key System
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<b>[Product Information]</b><br>
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<li>Detects; CLASS/FSK signal (message waiting visual feature).</li>
<li>IP,PBX and Key system that uses the message waiting visual Signal (CLASS/FSK Signal).</li>
<li>Line powered, no battries or transformers.</li>
<li>FCC approved.</li>
<li>This is the only unit manufactured that works with a residential/IP line.</li>
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