Now, a few weeks after the purchase I am still very satisfied with the purchase. Bluetooth and handsfree option work perfectly, the sound is also compared to other competitors, very good. The shooter must be loaded with any standard USB charging cable for mobile phones, the battery lasts minimum 5 hours (when using Bluetooth) and the range of Bluetooth is about 5-10 meters indoors (depending on how many walls are in between) which is sufficient for my needs.
Two small minuses there:
1: at full volume the sound is not clean, but full volume is actually very noisy.
2: a volume knob on the shooter itself would be a nice update, but not mandatory.
Conclusion: Super device, good quality, fair price (especially compared to the competition), good battery life, good Bluetooth receiver and Best Sound. I would buy again!