2.5mm Plug EarBud Headset Plantronics MX256-X1 EarBud Headset with Noise-canceling Microphone w/2.5mm Plug. Unparalleled comfort with unique Flex Grip design. Talk anywhere with the benefits of a noise-canceling microphone. Ultimate voice clarity with pivoting boom. Easy to use with quick, one-handed placement. Compatible with Motorola Phones with 2.5mm.