How to cancel Hongtai perpetual calendar b228 alarm clock?

The digital calendar adjuster has four keys, namely, exit, run (down), up and set, corresponding to D, C, B and A respectively. Cancel the alarm clock operation method is as follows:

First, press and hold the setting key (3-5 seconds) until you enter the alarm clock setting state, and then press the setting key again to select the corresponding alarm clock group;

2. After selecting grouping, press the up key, and a "-"will appear at this time, indicating that the alarm clock has been cancelled. Press the exit key at this time.