Works in principle, but "droning" ...

The part basically works: plugging in an iPod / iPhone dock (one with the "old" Dock port, not the new Lightning connector), and you can already connect with any Bluetooth devices (not just with Apple appliances, also works with for example the Kindle Fire HD). It is nice that the part also automatically maps at your fingertips. In many other receivers and speakers is only coupled when you manually select the appropriate device on the Bluetooth receiver, which nevertheless is sometimes quite annoying.

So far so good, now comes the negative criticism:
The part has apparently greater timing issues. When times longer so listening to music, it happens all the time that the playback speed varies. I am reminded of my childhood, when old tapes chanted because the recorder is not contrived, vorbeizubefördern the magnetic tape at a steady speed on the reading head. Likewise, the sound here ... is me indeed a mystery how this can be in a purely digital device, but is so, and makes the thing IMHO useless. I've tried with 2 iPhones, an iPad and the Kindle Fire HD and another Android smartphone, with all the same effect can be observed.
I suspect that the thing has problems with the clock generation / synchronization and is caused by the readjustment of the frequency of the effect described. I still have several Bluetooth speaker and speakerphone in cars, which is something I never experienced ...

I can buy so recommend, better take any other comparable adapter (can not provide specific recommendations, because I have not tried any other).