MO300 The MO300 adapter offers the ultimate in handsfree mobility. This cable has a mobile handset connector on one end and a Plantronics QD with integrated hookswitch control on the other. When plugged into a EncorePro™ headset (which is required in addition to the cable) it provides outstanding audio quality, all-day comfort and ease of operation. This all combines to provide a headset solution designed for the most demanding of users. Key features Choice of headset style including twin earpiece (binaural) All day comfort Integrated in-line call answer/end controls