ECOTEST DKG-21 Operating Manual page 50

Press the THRESHOLD button and hold it down until the two digits to
the right from the ":" symbol start blinking to correct the alarm clock settings.
Release the button afterwards. Set the proper values of units and tens of
minutes by further pressing and holding the THRESHOLD button. The
minutes can also be corrected by short pressing of the THRESHOLD button.
The value will change per unit each time in this case. Press shortly the MODE
button to correct the value of hours. The two digits to the left from the ":"
symbol start blinking at that. Hour values can be corrected likewise.
Press shortly the MODE button to switch the alarm clock on/off after
setting its triggering time. A blinking "WARNING" transparency should
appear on the digital dLCD.
Press shortly the THRESHOLD button; make the non-blinking
"WARNING" transparency appear on the dLCD to switch the alarm
clock on.
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