Logitech (981-000513) H650e Business Mono Headset, Bi-directional ECM Microphone, USB - Black

Logitech (981-000513) H650e Business Mono Headset, Bi-directional ECM Microphone, USB - Black Microphone: Bi-directional ECM Frequency response: 100 Hz - 10 KHZ Sensitivity: -45 dB +/- 3 dB Distortion: <10% @ 1 kHz, 15 dBPa (MRP) input Operating voltage: 1.4 - 5.0 V DC Speakers: Frequency response: 50 Hz - 10 kHz (Diffuse field) Warranty: 2 Years Warranty Period