The Bose MIE2 Mobile Headset is designed to provide listeners with uncompromising sound quality and stability while listening to music or making calls on their smartphones and mobile player devices. TriPort acoustic headphone technology delivers the natural sound quality and detail expected of Bose. The MIE2's stability lends itself to active listening during rigorous workouts, sports, etc. StayHear eartips are crafted to nestle inside the bowl of the ear, while also naturally conforming to the ear's upper ridge. The tips come in three sizes for hours of comfortable listening. The rugged cable features an inline microphone with answer and end control buttons, making them ideal for use with most cell phones and smartphones.