After some browsing I have these speakers found at Amazon and also ordered this.
The Speaker had been a while in use and I am very excited:
-Bluetooth Interface with the phone goes smoothly. It is even a voice message when you connect and even when you remove the connection.
- There is a Micro SD card slot for direct playback.
- You can adjust the volume with hardware buttons and change the songs.
- The sound quality is for such a small "device" really very good and also the bass is good, the speaker vibrates strongly in the hands at full volume
- The processing is top notch and very robust.
- The company is located just a few kilometers from my area :)
I am very convinced of the Speaker and would again accessed, so 5 stars!