Pantech OEM MONO Headset Hands-free Earphone Earpiece Original Single Earbud Wired Headphone with Microphone for AT&T Pantech Matrix C740 High Quality Drivers deliver crisp and clear sound. Sleek and simple design. Adjustable length cable and shirt clip to optimize position of microphone. Easy to use control button, so you can answer, end or mute phone calls (phone must support this).