Abstract: An illuminated house light display system and a telephone operated emergency indicator device for activating the display. The circuit responds to the dialing of the numeric emergency sequence "9-1-1" and the test sequence "#-9-1-1" and activates the display to provide a visual warning signal to guide summoned emergency personnel. Reset may be accomplished anytime by lifting the handset and dialing a "#". The generally cubical address display is externally mounted in a clearly visible place. The illuminated display comprises a resilient housing preferably fitted with a translucent, marked screen bearing the appropriate indicia. A bright strobe warning light is housed within the address box. The electronic circuit is mounted within a control box, and it is interconnected with the telephone line via a conventional jack. The circuit comprises a decoder which senses the dialing of digits, and an Initiation circuit interconnected with the decoder.