Plantronics MDA100 QD PC / telephone switch Connects PCs to desk phones and Plantronics QD headsets Easily toggle between PC and landline calls Mute button with visual status makes it easy to silence calls Compatible with PCs, Macs and softphones supporting Plantronics Hub Softphone compatibility: Microsoft, Avaya, Cisco Includes: MDA100 QD, 3 m QD cable, RJ9 cable, USB to Micro USB cable