CCTV Microphone,Frequency response:1005500HzThe adjustable sensitivity. Bug range:100 square meters. CCTV Microphone characteristic:Using high fidelity,low noise processing chips,voice clear,low noise,appearance fashion,which applies to a variety of situations.OperatingVoltage:612VDCFrequency response:1005500HzThe adjustable sensitivity.Bug range:100 square meters.