... Goose neck 2, -47dB+_2dB 3, Alone one or for PCS. 4, Passed ISO ,CE Certi We are manufacturer, ... microphones.1, Goose neck2, -47dB±2dB.3, Alone one for pcs.4, Passed ISO, CE, Certificate etc... Systems function: ... control the wire way. 3, Alone one or for pcs microphone working at the same time ... . 4, The chairman, representative Master. head microphone within ...