These indicator panels use the larger style 20 digit LCD modules, the two rows of text are displayed using illuminated 12mm high characters. Each indicator panel has an integral sounder and includes a mute switch to silence the call tone for a pre-determined period. The unit displays two calls simultaneously and if more calls are made, the display can be scrolled to show each call in turn. Differing call tones let the staff know what level of alarm call has been initiated. A further button allows the installing engineer to adjust the settings of the display, these include day/night time volumes and mute delay. Another feature allows any of the control buttons to be isolated preventing misuse.