Battery lasts long enough - working mostly reliable - sound a little too quiet

After suddenly the headphone jack gave up the ghost in my Smartphone, I decided to buy this Bluetooth headset.
If you have a smartphone / tablet with NFC pairing works extremely quickly, even without it works without problems.
The battery keeps the device very good, I often listen to music and charge the headset max. 1x / week.
I notice with the headset actually not Qualitätseinbußungen the music, but the headset is even on the noisiest stage in my opinion much quieter than if you would include a headset directly via jack to a device.

If I order in the city listening to music, it happens every now and then, causing interference with the Bluetooth signals and thus to interruptions of the music.

What bothers me a bit about this headset is that the sound that the device upon reaching the loudest volume takes place, is too loud.

Conclusion: on the whole, I am very satisfied with this device

Addendum:
a colleague has exactly the same product, we tried what happens when we each put the playback end cell phone + adapter next to each other: absolutely no interference and thus undisturbed music enjoyment! TOP

Supplement No. 2.:
Unfortunately, I have the headset thrown unintentionally with my clothes with the washing machine, apparently it has not survived :( (which is rather less surprising well). should no longer work there, I will definitely buy it again for me

Supplement No. 3.:
Allow to dry for something and recharge the device will work in spite of washing machine gear (see Addendum 2) still !!! Am excited :) thought I would re-invest 25