RoadKing RK564PCH Chrome 4-Pin Dynamic Noise Canceling CB Microphone with Flex Cord 6-Conductor Black Coiled Flex Cord 2 Position Momentary Slide Switch, Normally Open Contacts Frequency Response: 100Hz - 8kHz, Output Level @ 1kHz Open Circuit: -72dB (ret. 0dB = 1V/Ohm Bar Power Level: -55dB (ret. 0db = 1Mw/10 Ohm Bar