Nice and quiet and strong

The pump is much quieter than my Eheim pumps (100 and 400).
However, she came easily broken at: the plastic eyelet at one could hang the pump was broken and the dial lies not rotate ...
Since the pump is vibrating very little one can do without a hang; the controller to reduce the airflow goes to violence again ....
Consumption is ca.2Watt.Die pump is just as strong as my Eheim 100th
There seems to be a strong quality and volume variation in air pumps: one Eheim400 and two Eheim100 were broken already after 1 year.
All three were different, according to (only one was acceptable quiet, but still louder than this pump)
Bin How long does this curious part.
7:10:11 Postscript: I once ordered me 2 pumps: both also run properly - just as vigorously but quieter than my Eheim 100th