Yealink T4 series Expansion Module<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><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></ul></div><img src="http://ecx.images-amazon.com/images/I/41DtD8036LL.jpg" noproxy>