The first delivery was a loose connection and the batteries were empty overnight. Switching on and off was a gamble, because the knob sunk deep and thus was hardly accessible and the battery contacts had to be moved again. In each case one screw needs to be removed to open the tray. Has exercised my right of withdrawal. When this second device, the batteries are not automatically overnight empty, like its predecessor, the on-off switch, however, is different than the photos shown, again as deep under the disguise that it can only be achieved with a fingernail and it Again, there is a contact problem, although less, which can be corrected by the pressure on the cover to the battery compartment. Otherwise, if it is running, the machine works very well. Actually produces a lot of bubbles and is generally good to use except for the switching on and off.
