Polycom, Inc. VVX Color Expansion Module
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<b>[Product Information]</b><br>
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<li>Compatibe with VVX 300 VVX 310 VVX 400 VVX 410 VVX 500 and VVX 600</li>
<li>28 multifunctional line keys configurable as line registration call appearance speed dial DSS or BLF</li>
<li>Dual color illuminated LEDs for line status information</li>
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