The plantronics mo300 enabling cable for intensive phone users wanting a professional headset for use on theirmobile phones users need the professional headset for all day comfort and absolute audio qualitythe cable has a mobile connector on one end and a plantronics qd with integrated hookswitch controlon the other endcompatibility sonyericsson phones such as k200i k220i k310i k320i k510i k530i k550i k550im k610i k610im k630i k660i k750i k770i k800i k810i k850i p1i v630i v640i