Cisco Bang and Olufsen 980 Headset - Stereo - Mini-phone (3.5mm), USB - Wired/Wireless - Bluetooth - 39.4 ft (12 m) - 24 Ohm - 20 Hz to 20 kHz - Over-the-ear - Binaural - Circumaural - MEMS Technology, Uni-directional Microphone - Noise Canceling - First Light