Debugging method: Press and hold the middle button for 3 seconds while the time is displayed to enter the time setting mode. The hour on the left side will flash. At this time, press the middle button to increase the hour by one hour. After adjusting the hours, press the middle button for about 3 seconds. The minutes will flash. Press the middle button to increase one minute. After debugging for several minutes. . Press the middle button for about 3 seconds. The year flashes (Y 00 ~Y appearing at this time represents the year). Press the middle button to increase one year at a time. After adjusting the year, press the middle button for about 3 seconds. The month starts to flash. Press the middle button to increase one month at a time. After adjusting the month, press the middle button for about 3 seconds. The date starts to flash. Press the middle button to increase one month at a time. one day. After debugging, please do not touch any keys. It will automatically exit the setting state. Power-saving design. If not operated for 5 seconds, it will automatically enter sleep state.