Hkoenig BW1890 Manuel D'utilisation page 16

Turn on the power switch to "I" position to power on the beer
6.
cooler. (While "0"position is to power off it).
NOTES: Please make sure your hands are dry when you operate
the beer cooler, to avoid electric shock.
It will take 19-21 hours to cool the beer to 0-4℃ at 22-24
7.
℃ambient temperature. And it can keep the temperature as set
and displayed on the LED. (The LED will display the real
temperature of the beer). We do, however, suggest that you
initially cool your beer keg for at least 12 hours in your
refrigerator before placing it into the beer cooler, especially
when the ambient temperature is higher than 25℃.
The beer cooler has 6 preset temperatures.
8.
Press and hold "-" button, it enter the 6 preset temperatures, then
you can press "-" button to choose a certain preset temperature,
4℃, 8℃, 9℃, 10℃, 11℃ and 12℃.
Press and hold "+" button, it enter the 6 preset temperatures, then
you can press "+" button to choose a certain preset temperature,
4℃, 8℃, 9℃, 10℃, 11℃ and 12℃.
All manuals and user guides at all-guides.com
Switch is on "off " status
Figure 19
Connector