not more than 6 weeks functional!

After the purchase I was actually pleasantly surprised by the part. Use at SGS II for running training.
Use 3 - 5 times a week for 1 hour each. Since last week, the battery of the part is always empty, although he had no more than 1 hour running time after the last relevant training and store it. Days later, when re-use => Battery empty and at an operating time of only about an hour!

Addendum 1
Today now I've noticed that the thing can no longer be off. After pressing the middle Play / Pause prolonged
Button is actually a red LED signal that the unit is switched off. However, this LED will no longer appear.
Only when you connect the adapter to charge to the charging socket, then the red LED appear which means you have the thing immediately after use hang on the charging socket, otherwise the next training nix with music on the headphones. Even the longest press leaves the blue (operation) LED not disappear and show the red LED, which indicates that the part is turned off.
It is best to stick to the good old cable connection before you spend your money for such Bluetoothkram.

Supplement 2 (08.11.2013)
Pearl had exchanged this thing after returning with error description for a new one the same device.
That's why I'm giving 3 times *, VLT. I had at first so again as a famous "Monday Model".
Result: now remains to be seen even know how many training sessions I can now accompany the thing.