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By certification 
1.LCD display
2.Display: year, month, day, hour, minute and second
3.Countdown timer, maximum time of 999 days 23 hours 59 minutes and 59 seconds
4.Alarm function,clear and loud
5.Calendar: 1999 to 2050
6.Credit card size and super-thin
7.Used both in the outdoor and indoor:school, laboratory, parking, nap alarm, kitchen cooking time control
2.Display: year, month, day, hour, minute and second
3.Countdown timer, maximum time of 999 days 23 hours 59 minutes and 59 seconds
4.Alarm function,clear and loud
5.Calendar: 1999 to 2050
6.Credit card size and super-thin
7.Used both in the outdoor and indoor:school, laboratory, parking, nap alarm, kitchen cooking time control
