EPOS ADAPT 660 Headset - Stereo - Sub-mini phone (2.5mm), Mini-phone (3.5mm), USB Type A - Wired/Wireless - Bluetooth - 82 ft - 490 Ohm - 17 Hz - 23 kHz - Over-the-ear - Binaural - Ear-cup - MEMS Technology Microphone - Noise Canceling - Black: