supply of table-top gooseneck delegate microphone unit- supplying and fixing of table top gooseneck professional digital delegate microphone unit with speaking key, visual status, built-in loudspeaker or equivalent monitoring, condenser/capacitor or equivalent, minimum 100 hz to 13 khz, iec 60914 or equivalent, etc. complete as reqd. as per specification attached. (m/s. heinrich or s s make)