POLY Blackwire 8225. Product type: Headphones, Wearing style: Head-band, Recommended usage: Office/Call center. Connectivity technology: Wired, USB connector: USB Type-A. Ear coupling: Supraaural, Headphone frequency: 20 - 20000 Hz, Impedance: 32 . Microphone type: Boom, Microphone frequency: 100 - 10000 Hz, Microphone sensitivity: -35 dB. Weight: 186 g
