The Xtream H5 multimedia headset with microphone is stylishly designed for active lifestyles. The 4-band 3.5 mm jack allows the headset to work directly with most mobile phone/audio devices. The 3.5 mm 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.