Yealink T4 series Expansion Module
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<b>[Product Information]</b><br>
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<li>An exclusive collection which quality and detailed designs</li>
<li>Rich visual experience with 160x320 graphic LCD</li>
<li>20 physical keys each with a dual-color LED</li>
<li>2 independent control keys are used for fast switch pages</li>
<li>Stand with 2 adjustable angles</li>
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