Enter the alarm adjustment first. If you press it again, you will enter the time and date adjustment mode.
Alarm adjustment:
Date-Toggles between hours and minutes.
Alarm-adjustment, A in the morning, P in the afternoon.
Time and date adjustment mode:
Date switch, in turn: seconds, minutes, hours, months, days and weeks.
Alarm-Adjust, where A is in the morning and P is in the afternoon.
Press MODE again to exit the adjustment mode.
DATE-Long press to display the date.
Alarm clock-long press to display alarm clock time.
Light-short press, backlight
Mode-short press to enter stopwatch mode, and start, pause, stop, reset date, alarm clock, etc.
Mode-Long press to enter adjustment mode.
Mode-Date-Press two keys at the same time to switch 12 hours /24 hours mode.
Press and hold the date, and then press the alarm to switch the date display mode: 5 23 (month/day) or 23 5 (day/month).
Press and hold ALARM, and then press ALARM to turn on/off the ALARM clock and the on-hour switch: alarm is the doorbell and CHIME is the on-hour time.
Maybe the definition of key is different. You can explore it again as I wrote.