Cisco 521 Headset - Mono - Mini-phone (3.5mm) - Wired - 90 Ohm - 50 Hz - 18 kHz - Over-the-head - Monaural - Supra-aural - Uni-directional, Electret, Condenser Microphone

Mini-phone (3.5mm) host interface for reliable data transfer and enhanced performance Hear low subs and soaring vocals with a frequency range of sound from 50 Hz-18 kHz Uni-directional microphone technology enables reliable voice transfer to ensure maximum usability Listen to your favorite music with this over-the-head design headset The 521 headset provides plenty of freedom with wired connectivity Boom/On-cable microphone design ensures maximum comfort and easy, hassle-free talking Great for Audio/Visual Labs, Assisted Listening Systems and more that have a Mono jack for non-stereo use Headset offers a dependable audio solution with maximum productivity