Super Part learn to trial and error and scores, unfortunately without AC adapter !!!

We bought a small keyboard for our 10 year old son who has musical instruments not care much about. He should thus get to learn a little fun and interest in music and the notes.
Now he is trying also diligently read: The plan worked!
The price Leistungsverh. For the device is in order, it is well made and what makes her. The sound is very good.
What annoyed me, unfortunately, that in the description was not clear that there is no AC adapter is. Thus, the disappointment was great when it was clear after unpacking that you can not play, since no batteries in the household goods and the adapter was missing. The Adapterr for just under 20 euros compared to the keyboard an expensive business!
For the missing adapter therefore a star deduction!