1. First, press the appointment and timing keys before selecting the function to enter the appointment mode.

2. Secondly, short press the appointment and timing keys, the time jumps to 15 minutes, and the digital tube displays 0: 15. Long press the appointment and timing keys, and the appointment time will jump continuously.

3. The last appointment time is 9 hours and 45 minutes, and the digital tube shows 9: 45. After setting the appointment time, press any function key to confirm that the appointment is successful and the digital tube is started.