POLY Blackwire C3225. Product type: Headset, 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, Noise reduction type: Passive. Microphone type: Boom, Microphone frequency: 100 - 10000 Hz. Weight: 121 g
