1.Double press up function 2.Real time clock with hours, minutes and second display. 3.A perpetual calendar(range from year 1900 to 2099). 4.12/24 hours mode clock. 5.World time for 16 cities. 6.An alarm time( tone can set one of 3 BiBi and 5 melodies.) 7.Count down timer with max 99 hour 59 min 59 sec. 8.8 digits calculator with "+","-","x","/","%","M+","M-" and "MRC" functions. 9.Smart up and down keys. 10.Key tone funtion