Type JMX168-3 in the warranty period of electronic calendar, maintenance only round trip shows the lunar calendar, the Gregorian calendar, week, time, temperature, luminous display, day and night are good, can also be the alarm clock, the whole point of time Oh, cut off and then plug in is the right time, no need to adjust. Size: length 23cm* width 17cm* thickness 3.8cm please don't imagine the size, than ordinary books (half the size of A4 paper) a little bit larger