supply of uhf dual-channel wireless handheld microphone system, supplying and fixing of uhf handheld wireless mic system set with one dual-channel receiver with two handheld dynamic transmitters, professional pll/equivalent transmission, 40 hz to 15 khz minimum response, dynamic range greater than equal to 90 db, snr, 90 db, thd, 0.5percent, wpc/dot compliant, etc. complete as reqd. as per specification attached. (m/s. heinrich or s s make)