Enjoy the convenience of one headset for music and calls with the MX100s from Plantronics?. One touch of a button lets users switch effortlessly between their iPod, or other multimedia device, and mobile phone. The 3.5 mm jack provides compatibility with personal multimedia devices including most MP3 players and laptops. AcuSpeak? technology ensures clear calls, and the Flex Grip? earpiece provides stability and comfort.