I make it short and sweet. The device may in a noisy office or a large space> 20sqm have his permission.
But the device already at level 1 is very 'good' audible and you should here have a very good sleep.
Level 2 and 3 are definitely not for the living rooms. Here, you feel like in a jet plane in front and to the very noisy air turbulence there is also still a high-frequency noise.
At the processing there is nothing to complain about. If you can ignore the volume could this "Gyro Gearloose" really his determination to be obeyed. The movement of the air ......
As all great advertising promises avail nothing, it just does not fit all ...
Ciao Fizelsche