Poly Savi 8220 UC MS USB-A Stereo Wireless DECT Headset System - Speaker Size: 32mm - Frequency Response: 100 ~ 6800Hz (Wideband), 20Hz ~ 20kHz (Media) - Speaker Impedance: 32 ohms - Microphone: Noise-cancelling - Battery Life: 13 Hours Talk Time, 50 Hours Standby - Wireless Range: Up to 180m (Line of Sight) - Wireless Connection: DECT 6.0 (D200 USB-A Adapter) - Stereo Audio with ANC - Microsoft Certified - 209214-02 - 12 Months Limited Warranty