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July 28, 2013 at 12:14 am #124648
Guten Tag (oder Abend) Herr Steiner
There is a switching power supply located behind the power cord, but it should run at too high a frequency to be audible.
I would suggest you run with it for a while to see if it portends other issues. If it does not, and you have no bats in your family, it's probably in ordnung.