This box was designed to accommodate one of the cheap OLED 128x64 graphic displays driven by an IOT ESP8266 WIFi microprocessor module. The software for the world clock can be found at www.esp8266.com, this shows the time in four cities (New York, London, Paris, Sydney) in a horizontally sliding frame display. See http://blog.squix.ch/2016/01/esp8266-weather-station-world-clock-demo.html for details and links