Rosendahl nanoclocks GL - Manual (Page 5)

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2. Connection to Power Supply
Attention! Before connecting to mains please check the voltage
selector on the left side panel.
Disconnect from mains before switching. Make sure the 115 / 230V
setting matches to your local mains voltage.
Use 230 VAC setting in the UK, EU.
Use 115 VAC setting in the US, Japan.
nanoclocks GL can also be powered by a 12 volt DC supply using
the 4-pin XLR connector, pin 1 is Ground (-) and pin 4 is Vcc (+) 12V.
The power button lights up green when the unit is powered by mains
and changes to red when the power source is DC.
If the DC supply drops below 10,6 Volts the red power LED starts
blinking.
Primary power source is always mains.
Feed mains and DC supply simultaneously to power the unit from
two redundant sources. When one of the sources fails the unit will
keep working without disruption.