EPOS ADAPT 661 Headset - Stereo - USB Type C, Sub-mini phone (2.5mm), Mini-phone (3.5mm) - Wired/Wireless - Bluetooth - 82 ft - 490 Ohm - 17 Hz - 23 kHz - Over-the-ear - Binaural - Ear-cup - MEMS Technology, Noise Cancelling Microphone - Noise Canceling