The microphone has video tracking ,voting(five key) and discussion functis. The microphone unit has built-in high fidelity of capacitor sound head, its sound quanlity is clear and low noise,it has strong pickup of distance. It has uppression the howling function,when the microphone is turn on, the loundspeaker will be automatically turn to prevent the voice transfusion. The unit has built-in speaker and headphone jack,it can play background music and expansion the voice. The annular blue indicator lamp can show the working sate on the microphone. The ON/OFF state, dynamic level and volume of microphone can show on the LCD. The chairman microphone can turn down the delegate unit by priority button. The meeting model:FIFO/FREE/LIMIT/CHARIMAN. The base of material is metal, and the PVC is aluminum. It can be desktop and embedded for installation , to meet a variety of meeting places installation requirements. Built-in speaker:8 /2W/70MM Type:capacitance Directivity:single Frequency response:60Hz-14Hz Sensitivity:-452db 1KHz Input voltage:DC 24V The minimum output impedance:1K Signal to noise ratio:>68db(A) Socket:8P terminal block Cables:2.1M/8P Shielding wire Accessories: windyproof sponge,3M of T wire