Cisco Wired/Wireless Over-the-head Stereo Headset - Carbon Black - Binaural - Circumaural - 6500 cm - Bluetooth - 32 Ohm - 20 Hz to 20 kHz - Noise Cancelling, Uni-directional, Noise Reduction, Condenser, Electret Microphone - Noise Canceling - USB Type A, Mini-phone (3.5mm)