LogiLink HS0056. Product type: Headset, Wearing style: Head-band, Recommended usage: Office/Call center. Connectivity technology: Wired, USB connector: USB Type-A. Ear coupling: Supraaural, Maximum input power: 20 mW, Headphone frequency: 20 - 20000 Hz. Microphone type: Boom, Microphone sensitivity: -36 dB, Microphone input impedance: 2200 ?