What does ABCD stand for?

Time setting: a- date and time setting/move b- alarm clock switch on the hour/add c- alarm clock setting/move d- adjust running birds (for example, set the morning of May 24th, 2004 as 10: 38), and press ". Press the "A" key again, the "Month" flashes, and press "B" to set it as "May" month; Press the "A" key again, the "Day" flashes, and press the "B" key to set it as "24th" day; Press the "A" key again, and the "hour" flashes; Press the "B" key in the morning and set it to "10"; Press the "A" key again, the "Minute" flashes, and press the "B" key to set it to "38" minutes; Press the "A" key again, and the "second" will flash; Press the "B" or "C" key to start counting from 00; (Note: This step is not displayed when there is no second digital tube. Press the "A" key again to exit the time setting. Alarm setting: press the "C" key to enter the alarm setting, the alarm serial number will be displayed at the position of the digital tube, and the digital tube will flash. Press the "B" key to select one of the settings of alarm 1 ~ 4; Blink when pressing the "C" key again, and press the "B" key to adjust to the set value; Press the "C" key to flash again, and press the "B" key to adjust to the set value; Press the "C" key again, and press the "B" key to switch when the position of the day digital tube shows "On" or "-"alarm status; After setting, press the "c" key again to exit the alarm setting. * Running water birdsong setting: When it is set to running water birdsong state, when it is time for voice time, there will be normal voice music time. At this time, the running water birdsong state will be turned off, and the normal running water birdsong function will be restored only after the time music is over. Tap the "D" key to adjust the running water birdsong, or press the "D" key until the running water birdsong is turned off when this function is not used. Call after power failure or plug it in after unplugging, with voice and music time telling functions. At this time, the running birdcall is turned off, and press the "D" key to switch to the working state of running birdcall. Note: As long as 1 or over 1 of the four alarms is set to ON, the alarm indicator will light up, and only when all alarms are turned off will the alarm indicator light go out. Hourly alarm setting: During normal operation, press the "B" key, and the hour alarm indicator lights up to indicate that the hour alarm has been turned on, otherwise, the light turns off to indicate that it has been turned off.

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