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