System functions: This is an electronic calendar with appointment reminder function. The specific functions are as follows: 1. Enter the starting date (year, month, and day), and count in days. The digital tube displays the year, month, and day. 2. It can distinguish the number of days in different months and determine whether it is a leap month according to the year. 3. You can enter a date and turn on the reminder function. When the time comes, there will be an alarm reminder until a specific switch is turned on to indicate that it is known.
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