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1. Press the A button in the standby mode to display the time normally. 2. Press B again to enter the hour debugging, the hour digit flashes, press A to set the hour. 3. Press B again to enter the minute debugging. The minute digits flash, press A to set the minute. 4. Press B again to enter the month debugging. The month digits flash, press A to set the month. 5. Press B again to enter the date debugging, the date digits flash, press A to set the date. 6. Press B again to enter the year debugging. The year digit flashes. Press A to set the year. 7. Press B again to enter the 12/24 hour setting, 12/24 will flash. 8. Press A to adjust the time system, then press B to return to the normal time interface. If there is no operation, it will automatically turn off after 3 seconds