The sound is very good and the fact that the speaker also has an FM radio, has a speakerphone and is waterproof justifies the price anyway. The Bluetooth connection has been very stable and I have had no disconnections or the like in a range of about 10 meters. The speakerphones I've used once and must say that this works very well. My interlocutor has understood me clearly and I could understand him easily. The FM radio automatically provides an Auto Scan function which stations with good reception are sought. This has so far worked without problems.
Splashing makes the speaker nothing from which the use in the shower does not cause problems. Also complete temporary immersion leaves no damage.
The battery life with active Bluetooth connection to the phone is also very good. Music playback of eight hours or more without any problems at full volume.
The processing is generally satisfactory. The speaker is made of plastic with a "rubbery" surface. The suction cup on the back is very big and is sticking to smooth surfaces. Only the cover for the Micro-USB connector makes a rather unstable impression and I fear that this does not hold in the long run.
All in all, I Tell the speakers so far. If me in the future something I'll notice add a response.
I am delighted with any feedback and possibly answer questions that arise like in the comments
