brand new and high quality Feature: Powerful and clear sound in unique design. Use this for a video conference. Superior clarity for voice. Notice: The Micphone cannot connect with Computer or for smart phone directly .It have to connect with loudspeaker for Using !!! This is for Head Wear Type Micphone ,for Head Mounted Micphone . Only Micphone !!! Not with earphone ! Please be attention !!! How to use: a directional microphone, make sure the microphone above two holes (sponge to the next can be seen) with the mouth, the most suitable distance away from the mouth microphone is 10-15MM the microphone plug into the corresponding receptacle on the host computer (not into the audio input jack hole) in order to achieve the best results, it is recommended to use the original microphone try to avoid multiple spots microphone plug, side cause poor contact Specification: Microphone core size: 9.7 * 5.0mm Sensitivity: - 52db 2db Direction:One-way Output impedance: 680 Operating voltage :1.0V-10V Frequency Range: 20-22kHz SNR: 55db Connector size:3.5mm Wire length:100cm/39''(approx) Material:Plastic Color:Black Quantity: 1 set Note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual colorof the item. Thank you!