Logitech EasyFit Boom Headset for Mobile Phones Adjustable earbuds fit comfortably and snugly in your ear thanks to Logitech's patented FlexLoop cushions in four sizes Sleek noise-canceling boom microphone delivers superior audio quality in high-noise environment such as airports Soft-touch rubber surface offers superior comfort and style Convenient call/answer button Requires Logitech EasyFit Connector (sold separately)