without compromising a very valent part

very high quality workmanship - running without noise. Various motion modes. The instruction manual is somewhat unclear, but may also give rise for entertaining "quizzes" to friends, acquaintances and colleagues. Very funny, but unfortunately not very helpful ....
. lt instruction manual has the built-in battery has a capacity of 50 hours in mode 1 = run six minutes, then 30 minutes of rest, etc.
How long does the battery ??

Unfortunately, I also had the wrong power supply = the American version. The attached key did not fit the lock.
Guests complained about - get an adapter (is still on the way) - will receive a credit for keys.
Comment of the supplier: professionally packaged, good and fast (and useful) communication.
I would buy the product at any time - a clear recommendation!