Casio G-Shock Gravity Master Black Dial Multi Solar Watch GPW1000T-1A Backlight:LED light (with super illuminator, afterglow function) Battery life:[after full charge drive time in state without solar generation] in the case of use of function: When, for approximately seven months, power saving is in a state: Approximately 18 months World time:Clock of 27 city (with 40 time zones, summer time set-up function) +UTC (coordinated universal time) of the world Electric wave automatic repair function:It is / manual operation reception &lt;Japan&gt; reception electric wave auto-receipt (up to six times/day) (as for up to five times/day of Chinese electric waves): JJY, frequency: 40kHz/60kHz (Fukushima / Kyushu bot