Plantronics' MX100 Cellular Headset is stable, discreet and comfortable. The Flex Grip™ design produces an exceptionally stable, comfortable fit and allows for one-handed placement in the ear. AcuSpeak™ technology allows you to hear and be heard, providing Plantronics' distinctive superior sound clarity. Customize the headset with three interchangeable color covers. The MX100 is compatible with most headset ready cellular phones including Motorola®, Samsung®, Audiovox® and Kyocera®; a headset adapter is required if your cellular phone does not have a headset jack.