Logitech H111. Product type: Headset, Wearing style: Head-band, Recommended usage: Office/Call center. Connectivity technology: Wired. Ear coupling: Supraaural, Headphone frequency: 20 – 20000 Hz, Impedance: 32 ?. Microphone type: Boom, Microphone frequency: 100 – 16000 Hz, Microphone sensitivity: -58 dB. Windows operating systems supported: Windows 7 Enterprise,Windows 7 Enterprise x64,Windows 7 Home Basic,Windows 7 Home Basic…, Mac operating systems supported: Mac OS X 10.5 Leopard,Mac OS X 10.6 Snow Leopard,Mac OS X 10.7 Lion,Mac OS X 10.8 Mountain…