The RoadKing RK56B has a 4-pin connector, black cycolac case and Noise cancelling dynamic microphone with a flexible black cord. 2 position momentary slide switch with normally open contacts. Frequency Response: 100Hz-8kHz, Output Level at 1kHz Open Circuit: -72dB (ret. 0dB=1V/Ohm Bar) Power Level: -55dB (ret 0dB=1Mw/10 Ohm Bar) Output Impedance: 2000 Ohms (Matches 600-5000 Ohm Inputs)