Base Line Annunciator with Hooter is microcontroller based and has abs plastic enclosure, ultra low power consumption. The Annunciator has operating temperature from 0& deg; C to 60 ° C, storage temperature from 10 ° C to 70 ° C. The Annunciator has the feature that all inputs are apt coupled and isolated from system power supply. The Annunciator has shock proof shrouded terminals. The Annunciator has dual size multi-coloured windows with ultra super bright led and is available from 4 to 24 windows. The Annunciator has shallow depth of 120 mm, field replaceable window legends and has wide range ac/ dc auxiliary supply. The Base Line Annunciator with Hooter is optically isolated fault inputs and has built in front accessible pushbuttons.