Lecture Speech Headset Mic Head-Mounted

"3.5Mm Plug Guide Lecture Speech Headset Mic Head-Mounted Head Wear Microphone Voice Amplifier Lightweight Over Head For Teachers Features: Suitable For Lecture, Teaching, Speech, Etc. 3.5Mm Plug. Clear Sound Recording. Mini Size, Lightweight And Portable. Flexible Mic, Adjust To Your Ideal Angle. Nylon Braided Durable Wire Body. Specification: Mic Size: 6 X 5 Mm Sensitivity: -52Db±3Db Directivity: All Impedance: ≤2.2Kohm Frequency Range: 100Hz-16Khz Snr: >60Db Wire Length: Approx. 1 M/3.28 Ft Packages: 1 X Lecture Headset With Mic"