To ensure visibility in dark environments, the watch's display is illuminated by a LED at the push of a button. Independent and environmentally friendly, solar cells provide the watch's power supply. Excess solar energy is stored in a battery. Whether in Europe, North America, and Japan, or in large parts of Canada, Central America, and China - once the watch is set to the local time zone, it receives the corresponding radio signal and always displays the exact time. In many countries, it also automatically adjusts for daylight saving time and standard time. The world time function shows the time in up to 29 different time zones.