- Lightweight comfort that is ideal for extended wear- Powerful noise isolation with unidirectional microphones that are designed to hone in on the userrs voice and simultaneously minimize background noise- Easy, intuitive user configuration experience when used with Cisco IP phones- Desktop USB adapter option - Connects quick disconnect to USB and provides easy access to key call control capabilities, including answer, end call, hold/resume (for multiple calls), mute, volume up, and volume down. General InformationThe Cisco Headset 500 Series is a professional range of headsets designed for Cisco IP Phones and soft clients.These headsets are optimized for workers in open work spaces so they can be more productive with vibrant audio, powerful noise isolation and exceptional comfort.Technical InformationConnectivity Technology: WiredSound Mode: StereoImpedance: 90 OhmMinimum Frequency Response: 50 HzMaximum Frequency Response: 18 kHzNoise Canceling: YesSound Pressure Level: 118 dBEarpieceEarpiece Design: Over-the-headEarpiece Type: BinauralMicrophoneMicrophone Technology: ElectretMicrophone Technology: CondenserMicrophone Technology: Uni-directionalMicrophone Design: BoomInterfaces/PortsHost Interface: USBPhysical CharacteristicsForm Factor: Supra-auralWarrantyLimited Warranty: 2 Year