A € 20 - speaker, does not disappoint.

Already have a lot of Bluetooth speakers tried.
This here suggests Wacker: Really good heights and useful middle.
The bass is not really there - who wants that, to the Bose for 130 euros must buy more.

Here are my + and - Review

(+)
- 1250 MH battery (Li-Ion)
- Excellent, low-distortion heights
- Viable centers
- Good, compact design, acting, despite plastic (grille is made of metal) and robust clean
processed.
- Plays MP3s via SD Card
- Relatively high volume possible
- Cheap price
- Paired without complications

(-)
- The touch operation is not flawless
- Hardly Bass (with EQ) - despite passive membrane. I suspect that the DSP circuits bass
wegfiltern and just do not have the speakers used the necessary stroke
- As opposed to the product description, there is no FM radio
- Annoying voice announcement, which unfortunately change to Chinese only English and not
lets leave.

Overall, I am not dissatisfied with this product - it makes a robust impression that will not disappoint especially jazz listeners or people with audiobooks.
People who want to have more bass from a small box must dig deeper into their pockets.
Thank you for reading!