Product details of USB Desktop Microphone Description: - Plug and Play - Easy Push Button Microphone On/Off - Directional Characteristics: Omni-Directional - Sensitive Range: -58+1dB at 1Khz - Impedance: 2.2K Ohms+30% at 1KHz - Max Input Sound Level: 115Db - Operating Voltage: 2.0V via USB How to Use. - Just plug in, wait for Hardware to automatically Install - Since every computer have Sound Card installed Sometimes it may Require to Switch the Microphone Settings to USB Audio Device - Accessories, Headsets & Microphones, Computer Peripherals What's in the box 1 x USB Desktop Noise Cancelling Mic Microphone for Computer PC Laptop