1.Designed in accordance to ISO and IEC914.2.The system power supply for all the delegate units is provided by the main unitat 18 safe voltage.3.9P-DIN plugs for system T-type connection.4.Electric capacity type microphone, equipped with windshield cover. 5.Extended pipe optional.6.The annular red indicator lamp could show the state of the microphone.7.The microphone has a speaking button and indicator lamp; it can control the stateof speech.8.The chairman unit number in the system is unrestricted, can join in any positionof the system.9.Turn down delegate MIC by press the priority button.10.Indicative sound for chairman unit (optional)11.Dimensions:55mmX130mmX105mm12.N.W.: 0.9kg13.Frequency response: 100Hz-13KHz14.Sensitivity: -44dB?dB15.Reference sound receiving distance: 20~120cm producing area:China payment:T/T in advance, L/C at sight supplying capacity:3000pcs/month