These Pyle headphones feature an ultra-slim design, and fit securely into any ear. They work great with your iPod, Zune, Sansa, MP3 player or Cell Phone with a standard 3.5mm headphone jack. The Built-In microphone allows you to use your headphones as a Headset, with a control button right on the microphone. This headset features a heavy duty metal speaker housings, and a colored plastic case on each ear bud. The microphone housing and 3.5mm headphone plug are also made of metal, making these headphones sound and feel great.