Fonus Universal Premium Over-the-Head Hands-Free Mono Headset Wired Headphone Corded Earpiece with 3.5mm Jack and Boom Mic Comfortable bugle for long time wearing, 3.5 mm Mono Headphone with Microphone Boom, On/Off button and clip. Adjustable fillet for different head sizes. High sensitivity on microphone and driver for clear communication. Fits either ear comfortably. Clear communication on both ends. The adjustable headband offers a secure fit without sacrificing comfort.