The Casio DQ-683 is a digital clock featuring an alarm with snooze functionality and a backlight. The manual details how to set the current time, including automatic day-of-the-week calculation and 12/24-hour format toggling, using the SET and Alarm Time Set buttons.
You can set the year in the range of 2000 to 2039.
When activated, the alarm sounds again about five minutes after it is stopped by pressing the Snooze/Light button.
You should replace the batteries at least once a year, even if they are still working properly.