Yealink WH63 Headset - Mono - Micro USB 2.0 - Wired/Wireless - DECT - 393.7 ft - 32 Ohm - 20 Hz - 14 kHz - Earbud, Over-the-head, Behind-the-neck, Over-the-ear - Monaural - Ear-cup - 3.94 ft Cable - Noise Cancelling Microphone: