Cisco Headset 531. Product type: Headset, Wearing style: Head-band, Recommended usage: Office/Call center. Connectivity technology: Wired. Ear coupling: Supraaural, Headphone frequency: 50 - 18000 Hz, Impedance: 90 . Microphone type: Boom, Microphone frequency: 150 - 6800 Hz. Sound pressure level (max): 118 dB
