The Xtream H5 Multimedia Headset with Microphone are stylishly designed for active lifestyles. The 4-band 3.5mm Jack allows the headset to work directly with most mobile phone/audio devices. The 3.5mm Adapter allows you to use the headset on computer systems that require separate input/output connections. The built-in microphone is omnidirectional which picks up sound with reliability and is flexible which allows you to adjust the position for optimal performance.