As can be seen in the title, have convinced me the following points:
1. Fairly quiet pump noise
2. Low power consumption (2.5 watts as measured by a Conrad-ammeter)
3. It is used by the majority of our four cats (which can guarantee in advance, of course, none)
Thus, the pump lasts longer and does not run around the clock, I have for EUR 10 a socket with motion sensor (can be found on Amazon, search terms "motion sensor socket") inserted in between. Now the fountain is only when a two- or four-legged approaches him.
Finally, the notice that the water at the start easily run over the edge, if you fill the wells to the MAX mark. Thought at first to a leak, but is not the case.
For this reason I forgive 5 stars because my cats and her underling are very satisfied.