The Xtream™ H5 Multimedia Stereo Headphones 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 omnidirectional microphone reliably picks up sound and is flexible, which allows you to adjust the position for optimal performance.The Xtream™ H5 Multimedia Stereo Headphones 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 omnidirectional microphone reliably picks up sound and is flexible, which allows you to adjust the position for optimal performance.