Cisco Headset 532 (Wired Dual with USB Headset Adapter) - Stereo - USB - Wired - 90 Ohm - 50 Hz - 18 kHz - Over-the-head - Binaural - Supra-aural - Electret, Condenser, Uni-directional Microphone - Noise Canceling

Hp Poly Headsets HP EncorePro Headset - Stereo - Wired - On-ear - Binaural - Ear-cup - Noise Cancelling Microphone - Black

Cisco Headset 531 (Wired Single with Quick Disconnect coiled RJ Headset Cable) - Mono - Quick Disconnect - Wired - 90 Ohm - 50 Hz - 18 kHz - Over-the-head - Monaural - Supra-aural - Electret, Condenser, Uni-directional Microphone - Noise Canceling

Cisco Headset 532 (Wired Dual with Quick Disconnect coiled RJ Headset Cable) - Stereo - Quick Disconnect - Wired - 90 Ohm - 50 Hz - 18 kHz - Over-the-head - Binaural - Supra-aural - Electret, Condenser, Uni-directional Microphone - Noise Canceling

Poly Blackwire C3215 Headset - Mono - Mini-phone (3.5mm), USB Type A - Wired - 32 Ohm - 20 Hz - 20 kHz - Over-the-head - Monaural - Supra-aural - 7.40 ft Cable - Noise Cancelling Microphone

Hp Poly Headsets HP EncorePro 310 Headset - Mono - Wired - 32 Ohm - 50 Hz - 8 kHz - On-ear - Monaural - Ear-cup - Noise Cancelling, Uni-directional Microphone - Noise Canceling

Grandstream GUV3000 Headset - Stereo - USB Type A - Wired - 150 Ohm - 100 Hz - 7 kHz - Over-the-head - Binaural - Supra-aural - 6.56 ft Cable - Noise Cancelling Microphone

Grandstream GUV3005 Headset - Stereo - USB Type A - Wired - 32 Ohm - 20 Hz - 20 kHz - Over-the-head - Binaural - Supra-aural - 6.56 ft Cable - Noise Cancelling Microphone