The Advanced Network Devices IPCSL-RWB is one of their larger IPclocks. It is most commonly used in auditoriums because of the larger text/number size. This IPclock includes the flasher feature. Flashers are very powerful and are used to notify an emergency situation or alert the audience of an upcoming message. IPCSL-F has an 8 inch PA speaker and a text size of 4.5 inches.